GPS Observables in Newtonian Spacetime or Why We Do Not Need ‘Physical’ Coordinate Systems |

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Sat Oct 12 2024 02:54:21 (14 hours)

# 1.

Mozota Frauca, Alvaro (2024) GPS Observables in Newtonian Spacetime or Why We Do Not Need ‘Physical’ Coordinate Systems. European Journal for Philosophy of Science, 14 (51). ISSN 1879-4912

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Sat Oct 12 2024 02:53:13 (14 hours)

# 2.

Mozota Frauca, Álvaro (2024) Time is Order. [Preprint]

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Sat Oct 12 2024 02:51:48 (14 hours)

# 3.

Mozota Frauca, Alvaro (2024) In Which Sense Can We Say That First-Class Constraints Generate Gauge Transformations? Philosophy of Physics, 2 (1).

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Sat Oct 12 2024 02:51:00 (14 hours)

# 4.

Mozota Frauca, Alvaro (2024) Foundational Issues in Group Field Theory. Foundations of Physics, 54 (33). ISSN 1572-9516

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Sat Oct 12 2024 02:50:14 (14 hours)

# 5.

Mozota Frauca, Alvaro (2023) Geometrogenesis in GFT: An Analysis. Philosophy of Physics, 1 (1).

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Sat Oct 12 2024 02:49:02 (14 hours)

# 6.

Mozota Frauca, Alvaro (2023) Reassessing the problem of time of quantum gravity. General Relativity and Gravitation, 55 (21).

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Sat Oct 12 2024 02:44:12 (14 hours)

# 7.

Adlam, Emily (2024) Quantum Field Theory and the Limits of Reductionism. Synthese, 204 (80). ISSN 1573-0964

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Jean-Philippe Uzan

Fri Oct 11 2024 12:00:00 (1 day)

# 8.

arXiv:2410.07281v1 Announce Type: cross Abstract: Fundamental constants are a cornerstone of the physical laws. Any constant varying in space and/or time would signal a violation of local position invariance and be associated with a violation of the universality of free fall, and hence of the weak equivalence principle. It will reflect the existence of new degrees of freedom that couple to standard matter. Thus, testing for the stability of fundamental constants is of utmost importance for our understanding of gravity and for characterizing the domain of validity of General Relativity. Besides, it opens an independent window on dark matter and dark energy. As a consequence, thanks to the active development of experiments and of their accuracy, fundamental constants have become a key player in our search for physics beyond the standard model of and beyond General Relativity. This review details the roles of the fundamental constants in the laws of physics and in the construction of the International System of units. Then, the relations between constants, tests of the local position invariance and of the universality of free fall are exposed, as well as the construction of field theories that account for “varying constants”. Then, the main experimental and observational constraints are described. It details the basics of each system, its dependence with respect to the primary parameters the variation of which can be constrained from observations, the known systematics effects and the most recent constraints. It also describes how these primary parameters can be related to the fundamental constants and the model-dependencies. Both time and space variation are considered. Given the huge increase of data and constraints, a general scheme to present experimental and observational results and to construct a collaborative data base that will be more efficient for the community and allow for better traceability, is proposed.

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Joseph Balsells, Martin Bojowald

Fri Oct 11 2024 12:00:00 (1 day)

# 9.

arXiv:2410.08156v1 Announce Type: new Abstract: Classical clocks measure proper time along their worldline, and Riemannian geometry provides tools for predicting the time shown by clocks in both flat and curved spacetimes. Common approaches to time in quantum systems, based for instance on wave functions or density matrices, tend to obscure this geometric property at the quantum level. Here, a new framework is demonstrated for perturbing the classical path-length functional to include quantum degrees of freedom within a modified Riemannian geometry. In this framework, a quantum clock travels on geodesics of a family of spacetimes deformed by parameters specifying the clock’s quantum state. Detailed derivations provide potentially testable corrections to gravitational time-dilation in Schwarzschild spacetime that scale with the ratio of the clock’s Compton wavelength to its wave packet’s spatial extent.

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Hernando Quevedo

Fri Oct 11 2024 12:00:00 (1 day)

# 10.

arXiv:2410.07639v1 Announce Type: new Abstract: We analyze the equilibrium space of an ideal gas using the formalism of geometrothermodynamics. We introduce the concept of thermodynamic geodesics to show that the equilibrium space around a particular initial state can be divided into two regions, one that can be reached using thermodynamic geodesics and the second one forbidden by the second law of thermodynamics. Moreover, we show that, along thermodynamic geodesics, entropy is a linear function of the affine parameter, indicating that it can be used as a time parameter with a particular arrow of time determined by the direction in which entropy increases. We argue that entropy can also be interpreted locally as time in the case of any thermodynamic system in equilibrium and systems described within the scope of linear non-equilibrium thermodynamics.

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Chiara Marletto, Vlatko Vedral

Fri Oct 11 2024 12:00:00 (1 day)

# 11.

arXiv:2410.07262v1 Announce Type: new Abstract: Quantum theory and general relativity are about one century old. At present, they are considered the best available explanations of physical reality, and they have been so far corroborated by all experiments realised so far. Nonetheless, the quest to unify them is still ongoing, with several yet untested proposals for a theory of quantum gravity. Here we review the nascent field of information-theoretic methods applied to designing tests of quantum gravity in the laboratory. This field emerges from the fruitful extension of quantum information theory methodologies beyond the domain of applicability of quantum theory itself, to cover gravity. We shall focus mainly on the detection of gravitational entanglement between two quantum probes, comparing this method with single-probe schemes. We shall review the experimental proposal that has originated this field, as well as its variants, their applications, and discuss their potential implications for the quantum theory of gravity. We shall also highlight the role of general information-theoretic principles in illuminating the search for quantum effects in gravity.

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Amnon Aharony, Mustansir Barma

Fri Oct 11 2024 12:00:00 (1 day)

# 12.

arXiv:2410.07235v1 Announce Type: cross Abstract: This text was supposed to be included in the book “50 years of the renormalization group, Dedicated to the Memory of Michael E. Fisher”, edited by A. Aharony, O. Entin-Wohlman, D. Huse and L. Radzihovsky, World Scientific, Singapore (2024). It will be included in future printings and in the electronic version of the book.

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Thu Oct 10 2024 23:53:55 (1 day)

# 13.

Broka, Chris A. (2024) Degenerate States and the Problem of Quantum Measurement. [Preprint]

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Thu Oct 10 2024 23:49:30 (1 day)

# 14.

Huggett, Nick and Ladyman, James and Thebault, Karim P Y (2024) On the Quantum Theory of Molecules: Rigour, Idealization, and Uncertainty. [Preprint]

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Wouter van der Wijngaart

Thu Oct 10 2024 12:00:00 (2 days)

# 15.

arXiv:2407.09567v2 Announce Type: replace-cross Abstract: This manuscript proposes a conceptual hypothesis regarding the ontology of information, which can serve as a foundation for future empirical exploration and theoretical development. Starting from the premise that information consists of a structural pattern of matter and analysing the current understanding of the evolution of structures and complexity in the universe, we propose to redefine information as a physical structure capable of evolving and driving complexity across multiple layers of self-organization – biological, cultural, civilizational, and cybernetic. The perspective highlights how information structures replicate, vary, and evolve across different domains, speculating on the emergence of a cybernetic layer where machines could evolve autonomously. This interdisciplinary framework challenges traditional views of information and encourages further research into its role in shaping the structures of the universe, offering a new perspective on the evolution of complexity across both natural and artificial systems.

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Michael J. W. Hall

Thu Oct 10 2024 12:00:00 (2 days)

# 16.

arXiv:2406.19426v2 Announce Type: replace-cross Abstract: Does determinism (or even the incompleteness of quantum mechanics) follow from locality and perfect correlations? In a 1964 paper John Bell gave the first demonstration that quantum mechanics is incompatible with local hidden variables. Since then a vigorous debate has rung out over whether he relied on an assumption of determinism or instead, as he later claimed in a 1981 paper, derived determinism from assumptions of locality and perfect correlation. This paper aims to bring clarity to the debate via simple examples and rigorous results. It is first recalled, via quantum and classical counterexamples, that the weakest statistical form of locality consistent with Bell’s 1964 paper (parameter independence) is insufficient for the derivation of determinism. Attention is then turned to critically assess Bell’s appealing to the Einstein-Rosen-Podolsky (EPR) incompleteness argument to support his claim. It is shown this argument is itself incomplete, via counterexamples that expose two logical gaps. Closing these gaps via a strong “counterfactual” reality criterion enables a rigorous derivation of both determinism and parameter independence, and in this sense justifies Bell’s claim. Conversely, however, it is noted that whereas the EPR argument requires a weaker “measurement choice” assumption than Bell’s demonstration, it nevertheless leads to a similar incompatibility with quantum predictions rather than to quantum incompleteness.

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Iulian D. Toader

Thu Oct 10 2024 12:00:00 (2 days)

# 17.

arXiv:2410.06588v1 Announce Type: new Abstract: Most believe that there are no empirical grounds that make the adoption of quantum logic necessary. Ian Rumfitt has further argued that this adoption is not possible, either, for the proof that distribution fails in quantum mechanics is rule-circular or unsound. I respond to Rumfitt, by showing that neither is the case: rule-circularity disappears when an appropriate semantics is considered, and soundness is restored by slightly modifying standard quantum mechanics. Thus, albeit this is indeed not necessary, it is however possible for a quantum logician to rationally adjudicate against classical logic.

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Emily Adlam

Thu Oct 10 2024 12:00:00 (2 days)

# 18.

arXiv:2410.05508v1 Announce Type: new Abstract: In theories with a diffeomorphism symmetry, such as general relativity and canonical quantum gravity, it is often proposed that the empirical content is encoded in relational observables. But how do relational observables actually make contact with experience? I argue that this question can only be answered by providing a schematization of the observer which is appropriate for the context of a diffeomorphism-invariant theory. I suggest that this may require us to move away from a `passive awareness’ conception of consciousness towards a more agential conception, because there is a clear sense in which an embodied agent must experience herself as localised at a time. Finally, I consider what this means for the prospects of using quantum reference frames to address the problem of time, arguing that the way in which quantum reference frames are standardly described does not give us adequate resources to model agency, so some other kind of internal reference frame may be required to fully explain how we observe relational observables in the quantum context.

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Thu Oct 10 2024 01:39:46 (2 days)

# 19.

Murgueitio Ramírez, Sebastián (2024) Galileo’s Ship and the Relativity Principle. [Preprint]

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Tue Oct 08 2024 23:49:41 (3 days)

# 20.

de Canson, Chloé (2022) Objectivity and the Method of Arbitrary Functions. British Journal for the Philosophy of Science, 73 (3). pp. 663-684. ISSN 1464-3537

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Philip K. Schwartz, Arian L. von Blanckenburg

Tue Oct 08 2024 12:00:00 (4 days)

# 21.

arXiv:2410.02839v2 Announce Type: replace-cross Abstract: We critically discuss the claims of a recent article regarding the Newtonian limit of the teleparallel equivalent of general relativity (TEGR) in pure-tetrad formulation (arXiv:2406.17594). In particular, we refute this article’s purported main result that if a regular Newtonian limit exists, the torsion of the limiting derivative operator (i.e., connection) necessarily vanishes.

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Philip K. Schwartz, Arian L. von Blanckenburg

Tue Oct 08 2024 12:00:00 (4 days)

# 22.

arXiv:2410.01800v2 Announce Type: replace-cross Abstract: We extend well-known results on the Newtonian limit of Lorentzian metrics to orthonormal frames. Concretely, we prove that, given a one-parameter family of Lorentzian metrics that in the Newtonian limit converges to a Galilei structure, any family of orthonormal frames for these metrics converges pointwise to a Galilei frame, assuming that the two obvious necessary conditions are satisfied: the spatial frame must not rotate indefinitely as the limit is approached, and the frame’s boost velocity with respect to some fixed reference observer needs to converge.

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Flavio Del Santo, Nicolas Gisin

Tue Oct 08 2024 12:00:00 (4 days)

# 23.

arXiv:2409.10601v2 Announce Type: replace-cross Abstract: What is fundamentally quantum? We argue that most of the features, problems, and paradoxes — such as the measurement problem, the Wigner’s friend paradox and its proposed solutions, single particle nonlocality, and no-cloning — allegedly attributed to quantum physics have a clear classical analogue if one is to interpret classical physics as fundamentally indeterministic. What really characterizes quantum physics boils down only to phenomena that involve $\hbar$, i.e., incompatible observables.

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Bruno Galvan

Tue Oct 08 2024 12:00:00 (4 days)

# 24.

arXiv:2410.05228v1 Announce Type: cross Abstract: Cournot’s principle states that a typical event (i.e., an event with probability very close to $1$) occurs nearly certainly in a single trial of an experiment. This principle has been considered by various authors as the only connection between mathematical probability and the real world of experiments. To make the logical structure of the principle clearer, in this paper a reformulation of the principle is proposed. This reformulation is based on the following three elements: (1) The explicit definition of the empirical property of practical certainty, (2) the clear separation between probability measure and experiment, including the remark that typicality is a mathematical property defined by the probability measure while practical certainty is an empirical property defined by the experiment, and (3) the explicit formulation of the product rule for independent trials. The novel formulation then states that a probability measure $P$ $\textit{governs}$ an experiment $E$ if the events that are typical according to $P^n$ are practically certain according to $E^n$ for all $n \geq 1$, where $P^n$ is the $n$-fold product of $P$ and $E^n$ is the experiment whose trials are composed of $n$ trials of $E$. The novel formulation highlights the possible existence of two ambiguities in the principle, namely: (i) that different probability measures govern the same experiment and (ii) that the same probability measure governs different experiments. In this paper the first ambiguity is rigorously disproved, while the second is disproved provided that a suitable property characterizing the empirical equivalence of experiments is assumed.

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Jorge Manero

Tue Oct 08 2024 12:00:00 (4 days)

# 25.

arXiv:2410.04362v1 Announce Type: new Abstract: What is a physical theory? Although this intriguing question has been addressed from many different perspectives, some physicists and philosophers of physics have implicitly or explicitly embraced a philosophically-neutral definition of a physical theory, independently of the philosophical position endorsed with respect to it. Considering some objections against this view, I shall argue that the most appropriate definition of a physical theory already presupposes some commitments shared by a philosophical position associated with scientific realism. As we shall see, what physical theories and scientific realist positions have in common is the commitment of satisfying a non-factive notion of empirical adequacy, whilst a factive notion of empirical adequacy shall be solely associated with scientific realism.

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Philip K. Schwartz, Arian L. von Blanckenburg

Mon Oct 07 2024 12:00:00 (5 days)

# 26.

]]>arXiv:2410.02839v1 Announce Type: cross Abstract: We critically discuss the claims of a recent article regarding the Newtonian limit of the teleparallel equivalent of general relativity (TEGR) in pure-tetrad formulation (arXiv:2406.17594). In particular, we refute this article’s purported main result that if a regular Newtonian limit exists, the torsion of the limiting derivative operator (i.e., connection) necessarily vanishes.

A Treatise of Humean Nature: Being an Attempt to Introduce the Experimental Method of Reasoning Into The Metaphysics of Laws; And, Dialogues Concerning Natural Philosophy |

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Sat Oct 05 2024 23:46:33 (1 day)

# 1.

Dewar, Neil and Weatherall, James Owen (2024) A Treatise of Humean Nature: Being an Attempt to Introduce the Experimental Method of Reasoning Into The Metaphysics of Laws; And, Dialogues Concerning Natural Philosophy. [Preprint]

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Sat Oct 05 2024 01:15:53 (2 days)

# 2.

Gasco, Enrico (2024) An information analysis of the ‘Physical Object’ concept in Copernican Revolution. XLIII SISFA proceedings. pp. 45-52.

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Sat Oct 05 2024 00:59:44 (2 days)

# 3.

Bamonti, Nicola and Cinti, Enrico and Sanchioni, Marco (2024) Quo Vadis Wheeler-deWitt Time? Challenging Emergent Time in Quantum Cosmology. In: UNSPECIFIED.

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R. E. Kastner

Fri Oct 04 2024 12:00:00 (2 days)

# 4.

arXiv:2406.17290v2 Announce Type: replace-cross Abstract: Quantum theory in its conventional formulation is notoriously subject to various measurement-related paradoxes, as exemplified by the “Schrodinger’s Cat” and “Wigner’s Friend” thought experiments. It has been shown, for example by Frauchiger and Renner, that nested measurements such as those occurring in the Wigner’s Friend experiment can lead to inconsistencies concerning the putative outcomes of measurements. Such inconsistencies are commonly presumed to remain private and incommensurable, but this is not the case. A counterexample, in which the inconsistencies can be revealed among the observers, is reviewed. The implications for a recent attempt to shield Relational Quantum Mechanics from such inconsistencies are considered, and it is concluded that the attempt is not successful. Further implications for the state of the debate concerning the viability of quantum theory in its various formulations are discussed.

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Boris Zilber

Fri Oct 04 2024 12:00:00 (2 days)

# 5.

arXiv:2410.01846v1 Announce Type: cross Abstract: One of the main claims of the paper is that Dirac’s calculus and broader theories of physics can be treated as theories written in the language of Continuous Logic. Establishing its true interpretation (model) is a model theory problem. The paper introduces such a model for the fragment which covers “free theories”, that is physical theories with Gaussian (quadratic) potential. The model is pseudo-finite (equivalently, a limit of finite models), based on a pseudo-finite field in place of the field of complex numbers. The advantage of this unusual setting is that it treats the quantum and the statistical mechanics as just domains in the same model and explains Wick rotation as a natural transformation of the model corresponding to a shift in scales of physical units.

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Adam Caulton

Fri Oct 04 2024 12:00:00 (2 days)

# 6.

arXiv:2410.02356v1 Announce Type: new Abstract: In this paper I aim to defend one version at least of Hume’s dictum: roughly, the idea that possibility is determined by ontology through something like independent variation. My defence is broadly pragmatic, in the sense that adherence to something like Hume’s dictum delivers at least three benefits. The first benefit is that, through Hume’s dictum, a physical theory’s ontology delimits a range of possibilities, that I call \emph{kinematical possibilities}, which serves as a sufficiently permissive notion of possibility to sustain something like an intensional semantics for its claims, and a sufficiently demanding notion of supervenience to sustain plausible claims of inter-theoretic reduction and theoretical equivalence. The second benefit is that Hume’s dictum allows us to work backwards from a range of kinematical possibilities to an ontology. This is especially useful when aiming to glean an interpretation of a physical theory, since often we are more confident that we have arrived at the right space of possibilities than that we have arrived at the right ontology. The third benefit is that Hume’s dictum — at least the version I aim to defend here — may be applied to physical theories more or less as we find them, and therefore we can practice something resembling ontology without having to force our theories into some Procrustean bed, such as a first-order language.

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Fri Oct 04 2024 00:03:33 (3 days)

# 7.

Caulton, Adam (2024) Is a particle an irreducible representation of the Poincaré group? [Preprint]

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Fri Oct 04 2024 00:01:47 (3 days)

# 8.

Caulton, Adam (2014) Qualitative individuation in permutation-invariant quantum mechanics. [Preprint]

View enclosure: preview.jpg [image/jpeg]

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Fri Oct 04 2024 00:01:11 (3 days)

# 9.

Caulton, Adam (2024) Entanglement by (anti-)symmetrisation does not violate Bell’s inequalities: so what kind of entanglement does? [Preprint]

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Thu Oct 03 2024 23:56:28 (3 days)

# 10.

Barrett, Thomas William and Manchak, JB (2024) What Do Privileged Coordinates Tell Us About Structure? [Preprint]

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Thu Oct 03 2024 23:51:10 (3 days)

# 11.

Gao, Shan (2024) Simplest Quantum Mechanics: Why It Is Better Than Bohmian, Everettian and Collapse Theories. [Preprint]

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Philip K. Schwartz, Arian L. von Blanckenburg

Thu Oct 03 2024 12:00:00 (3 days)

# 12.

arXiv:2410.01800v1 Announce Type: cross Abstract: We extend well-known results on the Newtonian limit of Lorentzian metrics to orthonormal frames. Concretely, we prove that, given a one-parameter family of Lorentzian metrics that in the Newtonian limit converges to a Galilei structure, any family of orthonormal frames for these metrics converges pointwise to a Galilei frame, assuming that the two obvious necessary conditions are satisfied: the spatial frame must not rotate indefinitely as the limit is approached, and the frame’s boost velocity with respect to some fixed reference observer needs to converge.

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Nicolas Gisin

Thu Oct 03 2024 12:00:00 (3 days)

# 13.

arXiv:2410.01279v1 Announce Type: cross Abstract: I argue that scientific determinism is not supported by facts, but results from the elegance of the mathematical language physicists use, in particular from the so-called real numbers and their infinite series of digits. Classical physics can thus be interpreted in a deterministic or indeterministic way. However, using quantum physics, some experiments prove that nature is able to continually produce new information, hence support indeterminism in physics.

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Sebastian De Haro

Thu Oct 03 2024 12:00:00 (3 days)

# 14.

arXiv:2410.00935v1 Announce Type: new Abstract: This is a review of James Read’s insightful book, Background Independence in Classical and Quantum Gravity. The book introduces various notions of background-independence which it then makes precise, and uses to make verdicts about background-independence on a wide range of examples of spacetime theories in both classical and quantum gravity. This short book is, in several ways, a worthy example of how technical philosophy of physics ought to be done. I first discuss the content, then raise a number points where I disagree with the book.

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Mike D. Schneider

Thu Oct 03 2024 12:00:00 (3 days)

# 15.

arXiv:2410.00932v1 Announce Type: new Abstract: Physicists and philosophers are increasingly prone to regarding our current physical theories as providing ‘effective descriptions’ of real-world systems. In the context of quantum gravity research, this fuels a common view that the classical spacetime theory of general relativity provides effective descriptions where it is successfully applied. That common view of general relativity, in turn, encourages an ‘effective’ understanding of spacetime emergence. But descriptions of spacetime in general relativity irreducibly include global physical content, which is not effective. Recognizing this fact reigns in the interpretive scope of the common view of general relativity and specifically undermines our thinking about spacetime emergence effectively.

from

Wed Oct 02 2024 23:59:34 (4 days)

# 16.

Dawid, Richard and Thebault, Karim P Y (2024) Decoherence and Probability. [Preprint]

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Wed Oct 02 2024 23:58:13 (4 days)

# 17.

Hashemi, Ataollah (2024) How to Understand Russellian Panpsychism. Erkenntnis. ISSN 0165-0106

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M. Shifman

Wed Oct 02 2024 12:00:00 (4 days)

# 18.

arXiv:2401.11027v3 Announce Type: replace Abstract: The first Edition of this book was released in 2000, just before the symposium “Thirty Years of Supersymmetry” was held at the William I. Fine Theoretical Physics Institute (FTPI) of the University of Minnesota. Founders and trailblazers of supersymmetry descended on FTPI, as well as a large crowd of younger theorists deeply involved in research in this area. Since then 23 years have elapsed and significant changes happened in supersymmetry (SUSY). Its history definitely needs an update. Such an update is presented below. The Second Edition of the revised collection will be released in 2024.

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Taha Sochi

Wed Oct 02 2024 12:00:00 (4 days)

# 19.

arXiv:2410.00040v1 Announce Type: cross Abstract: This is the first of a series of papers that we intend to publish about the epistemology of fundamental physics in its current state. One of the main objectives of these papers is to improve our understanding of fundamental physics (and modern physics in particular) from an epistemological and interpretative perspective (i.e. versus formal perspective). Another main objective is to investigate and assess the merit of searching for a unified physical theory (the so-called “theory of everything”) considering the fact that contemporary physics is a collection of theories created and developed by different individuals and groups of scientists in different eras of history reflecting different levels of scientific, philosophical and epistemological development and dealing with largely separate physical phenomena and hence such unification may mean “stitching together” an inhomogeneous collection of theoretical structures which may be clumsy (if not impossible) at least from an epistemological viewpoint.

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Ovidiu Cristinel Stoica

Tue Oct 01 2024 12:00:00 (5 days)

# 20.

arXiv:2210.07596v2 Announce Type: replace Abstract: I analyze the possibility of free-will in the many-worlds interpretation (MWI), arguing for their compatibility. I use as a starting point Nicolas Gisin’s “The Multiverse Pandemic” (preprint arXiv:2210.05377, after Gisin, N., “L’\’epid\’emie du multivers”, in “Le Plus Grand des Hasards”, Belin, Paris, 2010), in which he makes an interesting case that MWI is contradicted by our hard to deny free-will. The counts he raised are: (1) MWI is deterministic, forcing choices on us, (2) in MWI all our possible choices happen, and (3) MWI limits creativity, because everything is entangled with everything else. I argue that each of these features of MWI is in fact compatible with more freedom than it may seem. In particular, MWI allows compatibilist free-will, but also free-will very much like the libertarian free-will defined by Chisholm. I argue that the position that alternative choices exist as possibilities does not make sense from a physical point of view, but MWI offers a physical ground for alternatives.

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Francesca Vidotto

Tue Oct 01 2024 12:00:00 (5 days)

# 21.

arXiv:2409.19098v1 Announce Type: new Abstract: Our fundamental theories, i.e., the quantum theory and general relativity, are invariant under time reversal. Only when we treat system from the point of view of thermodynamics, i.e., averaging between many subsystem components, an arrow of time emerges. The relation between thermodynamic and the quantum theory has been fertile, deeply explored and still a source of new investigations. The relation between the quantum theory and gravity, while it has not yet brought an established theory of quantum gravity, has certainly sparkled in depth analysis and tentative new theories. On the other hand, the connection between gravity and thermodynamics is less investigated and more puzzling. I review a selection of results in covariant thermodynamics, such as the construction of a covariant notion of thermal equilibrium by considering tripartite systems. I discuss how such construction requires a relational take on thermodynamics, similarly of what happens in the quantum theory and in gravity

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John Realpe-G\’omez

Mon Sep 30 2024 12:00:00 (6 days)

# 22.

]]>arXiv:2112.15428v3 Announce Type: replace Abstract: Evidence is growing for the theory of embodied cognition, which posits that action and perception co-determine each other, forming an action-perception loop. This suggests that we humans somehow participate in what we perceive. So, how can scientists escape the action-perception loop to obtain an observer-independent description of the world? Here we present a set of conjectures informed by the philosophy of mind and a reverse-engineering of science and quantum physics to explore this question. We argue that embodiment, as traditionally understood, can manifest aspects of imaginary-time quantum dynamics. We then explore what additional constraints are required to obtain aspects of genuine, real-time quantum dynamics. In particular, we conjecture that an embodied scientist doing experiments must be described from the perspective of another scientist, which is ignored in traditional approaches to embodied cognition, and that observers play complementary roles as both objects experienced by other observers and “subjects” that experience other objects.

Consequences of the single-pair measurement of the Bell parameter

from quant-ph>arXiv:2409.02510

Marco Genovese, Fabrizio Piacentini

Bell inequalities represent a milestone for contemporary Physics, both for quantum foundations investigation and technological applications (e.g., quantum communication and entanglement certification). Although loophole-free tests have been recently performed, a strong debate is still ongoing on the actual meaning of Bell inequality tests, for example on the possible additional hypotheses (end eventual loopholes) to be included in Bell’s theorem, as well as on the implications for certain interpretations of quantum mechanics. A recent work [S. Virzì et al., Quantum Sci. Technol. 9, 045027 (2024)] challenges some of the statements appeared in this debate, achieving for the first time an experimental estimation of the entire Bell-CHSH parameter from a single entangled pair thanks to a weak-interaction-based measurement approach. Here we analyse the implications of this result for quantum mechanics foundations investigation, illustrating how it can tackle some of the aforementioned interpretations of Bell inequality tests and, more in general, of quantum mechanics itself.

Majorana and the bridge between matter and anti-matter |

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Francesco Vissani

Fri Sep 27 2024 12:00:00 (22 hours)

# 1.

arXiv:2409.17826v1 Announce Type: new Abstract: This short essay aims to offer a discursive presentation of three scientific articles by Ettore Majorana highlighting the fundamental importance of one of them – the last one – for the investigation of the intimate constitution of matter. The search for evidence to support Majorana’s thesis is the prime motivation of the conference “Multi-Aspect Young Oriented Advanced Neutrino Academy” at the G.P. Grimaldi Foundation in Modica, Sicily.

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Francesco Vissani

Fri Sep 27 2024 12:00:00 (22 hours)

# 2.

arXiv:2409.17824v1 Announce Type: new Abstract: The conceptual bases of Fermi’s $\beta$-ray theory (at its 90th anniversary) are examined, highlighting the innovative drive and inspirational role for the progress that followed just afterwards. Moreover, the three different ideas of the neutrino born from the proposals of Pauli 1930, again Fermi 1933 and Majorana 1937 papers are discussed, emphasising the interest of the latter for current expectations.

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Hai-Chau Nguyen

Fri Sep 27 2024 12:00:00 (22 hours)

# 3.

arXiv:2409.17574v1 Announce Type: new Abstract: Measurements remain as an interesting topic of research since the formulation of quantum theory. Attempts to model quantum measurements by unitary processes are prone to various foundational issues. Here, it is proposed that measurement devices can be modelled to have an open decoherence dynamics that is faster than any other relevant timescale, which is referred to as the ultradecoherence limit. In this limit, it is shown that the clicking rate of measurement devices can be derived from its underlying parameters, not only for the von Neumann ideal measurement devices but also for photon detectors in equal footing. This study offers a glimpse into the intriguing physics of measurement processes in quantum mechanics, with many aspects open for further investigation.

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A. Tononi, M. Lewenstein

Fri Sep 27 2024 12:00:00 (22 hours)

# 4.

arXiv:2409.17290v1 Announce Type: new Abstract: Proving the completeness of quantum mechanics has been a fundamental task since its foundation. After the formulation of the Bell inequalities, violated by quantum physics, it is nowadays believed that the theory is complete and non-local. While more general Bell-like inequalities, such as the one of Clauser and Horne, envisage a situation in which two parties choose at random two measurements to perform at causally-disconnected space-times, one could formulate temporal inequalities in which the two parties measure at different times. However, for causally-connected parties, these extensions are compatible with local hidden-variable theories, so that no quantum nature appears in such temporal correlations. Here we show that a temporal Clauser-Horne inequality for two spins is violated for nonzero time interval between the measurements if the two measured parties are connected by a spin chain. The chain constitutes a medium for the spreading of quantum information, which prevents the immediate signaling and thus the deterministic time evolution after the first measurement. Our result suggests that, as expected in a many-body setup, the Lieb-Robinson bound substitutes the speed of light as the fundamental limit for the spreading of information.

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Peyman Azodi, Benjamin Lienhard, Herschel A. Rabitz

Fri Sep 27 2024 12:00:00 (22 hours)

# 5.

arXiv:2409.17236v1 Announce Type: new Abstract: Despite significant progress in experimental quantum sciences, measuring entanglement entropy remains challenging. Through a geometric perspective, we reveal the intrinsic anti-symmetric nature of entanglement. We prove that most entanglement measures, such as von Neumann and Renyi entropies, can be expressed in terms of exterior products, which are fundamentally anti-symmetric. Leveraging this, we propose utilizing the anti-symmetric nature of fermions to measure entanglement entropy efficiently, offering a resource-efficient approach to probing bipartite entanglement.

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Fri Sep 27 2024 00:49:26 (1 day)

# 6.

Wolf, William J. and Read, James and Vigneron, Quentin (2023) The Non-Relativistic Geometric Trinity of Gravity. [Preprint]

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Wed Sep 25 2024 23:52:46 (2 days)

# 7.

Evans, Peter W. (2024) What is it like to be unitarily reversed? European Journal for Philosophy of Science. ISSN 1879-4912

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Wed Sep 25 2024 23:42:36 (2 days)

# 8.

Bonds, Liam and Burson, Brooke and Cicchella, Kade and Feintzeig, Benjamin H. and Lynnx, Lynnx and Yusaini, Alia (2024) Quantum Probability via the Method of Arbitrary Functions. [Preprint]

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Diederik Aerts, Jonito Aerts Argu\”elles, Lester Beltran. Massimiliano Sassoli de Bianchi, Sandro Sozzo

Wed Sep 25 2024 12:00:00 (2 days)

# 9.

arXiv:2409.15942v1 Announce Type: cross Abstract: Einstein’s article on the EPR paradox is the most cited of his works, but not many know that it was not fully representative of the way he thought about the incompleteness of the quantum formalism. Indeed, his main worry was not Heisenberg’s uncertainty principle, which he accepted, but the experimental non-separability of spatially separate systems. The same problem was also recognized, years later, by one of us, as part of an axiomatic analysis of the quantum formalism, which revealed an unexpected structural limitation of the quantum formalism in Hilbert space, preventing the description of separate systems. As we will explain, this limitation does not manifest at the level of the states, but of the projectors describing the properties, in the sense that there are not enough properties in the formalism to describe separate systems. The question remains whether separability is a possibility at the fundamental level and if a formalism should integrate it into its mathematical structure, as a possibility. To aid our intuition, we offer a reflection based on a powerful analogy between physical systems and human conceptual entities, as the question of separability also arises for the latter.

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Tue Sep 24 2024 23:45:59 (3 days)

# 10.

Azhar, Feraz and Linnemann, Niels (2024) Rethinking the Anthropic Principle. [Preprint]

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Tue Sep 24 2024 23:43:20 (3 days)

# 11.

Barrett, Thomas William and Manchak, JB (2024) Can We Recover Spacetime Structure from Privileged Coordinates? [Preprint]

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Donald Salisbury, Daniel Kennefick

Mon Sep 23 2024 12:00:00 (4 days)

# 12.

arXiv:1910.03753v2 Announce Type: replace Abstract: In a series of papers published in the course of his dissertation work in the mid 1950’s, Andrzej Trautman drew upon the slow motion approximation developed by his advisor Infeld, the general covariance based strong conservation laws enunciated by Bergmann and Goldberg, the Riemann tensor attributes explored by Goldberg and related geodesic deviation exploited by Pirani, the permissible metric discontinuities identified by Lichnerowicz, O’Brien and Synge, and finally Petrov’s classification of vacuum spacetimes. With several significant additions he produced a comprehensive overview of the state of research in equations of motion and gravitational waves that was presented in a widely cited series of lectures at King’s College, London, in 1958. Fundamental new contributions were the formulation of boundary conditions representing outgoing gravitational radiation the deduction of its Petrov type, a covariant expression for null wave fronts, and a derivation of the correct mass loss formula due to radiation emission. Ivor Robinson had already in 1956 developed a bi-vector based technique that had resulted in his rediscovery of exact plane gravitational wave solutions of Einstein’s equations. He was the first to characterize shear-free null geodesic congruences. He and Trautman met in London in 1958, and there resulted a long-term collaboration whose initial fruits were the Robinson-Trautman metric, examples of which were exact spherical gravitational waves.

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Dean Rickles

Mon Sep 23 2024 12:00:00 (4 days)

# 13.

]]>arXiv:2409.13297v1 Announce Type: new Abstract: Music has been called the temporal art par excellence. Yet, as this paper explains, it is also the atemporal art par excellence. The contradiction is, however, only apparent, and a result of viewing music from two possible perspectives. That it has these two perspectives is the focus of this paper. In particular, the way in which these two aspects of music allow it to function as a kind of conduit between transcendent and immanent; immaterial and material. This can help explain the power of music to touch places deep in the soul (the part of us that transcends matter and time), that other forms of art struggle to reach. A somewhat similar debate occurs in looking at mathematics from an ontological point of view. In particular the treatment of the real numbers. There are curious properties of real numbers that seem to put them, like music, in the realm of the transcendent: in terms of the amount of information to specify them, one requires infinite computer time since there is no repeating pattern to their decimal expansions. One must simply evolve the sequence, working through it, despite the fact that it might have a perfectly situated home in Platonia. In other words, bringing them into this world demands a temporal element. We explore these and other links to a variety of issues in physics, ultimately arguing for dual-aspect monism.

On the Justification of Unification as a Virtue of Scientific Theories |

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Sat Sep 21 2024 00:23:24 (9 hours)

# 1.

Singer, Eric (2017) On the Justification of Unification as a Virtue of Scientific Theories. Hofstra University, Hofstra University.

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Eiji Konishi

Fri Sep 20 2024 12:00:00 (21 hours)

# 2.

arXiv:2409.12322v1 Announce Type: new Abstract: In this article, we approach the structure of the quantum measuring system in the Euclidean regime of the classicalized holographic tensor network from the perspective of integrated information theory. As a result, we obtain the following picture of the Euclidean regime. First, there are complexes, which are independently accompanied by the level and structure of experiences, determined from the full transition probability matrix of the whole particle system. Second, the cause-effect structures of independent complexes would be directly entangled by the physical information propagation in the whole particle system. Finally, distinct full transition probability matrices of the whole particle system that exhibit the maximum cause-effect power may coexist.

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Bartosz Jura

Fri Sep 20 2024 12:00:00 (21 hours)

# 3.

arXiv:2408.10253v2 Announce Type: cross Abstract: In a recent paper as an alternative to models based on the notion of ideal mathematical point, characterized by a property of separatedness, we considered a viewpoint based on the notion of continuous change, making use of elements of a non-classical logic, in particular the fuzzy sets theory, with events represented as spatiotemporally blurred blobs. Here we point out and discuss a number of aspects of this imperfect symbolic description that might potentially be misleading. Besides that, we analyze its relation to various concepts used commonly to model physical systems, denoted by terms like: point, set, continuous, discrete, infinite, or local, clarifying further how our viewpoint is different and asking whether, in light of our main postulate, any of these notions, or their opposites, if exist, are in their usual meanings suitable to accurately describe the natural phenomena.

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Eleanor March, James Read

Fri Sep 20 2024 12:00:00 (21 hours)

# 4.

arXiv:2409.12200v1 Announce Type: new Abstract: The ultra-relativistic limit of general relativity is a theory known as Carroll gravity. We provide a philosophical introduction to the formalism of Carroll gravity, and to its status as a limit of general relativity; we also explore some of its various conceptually interesting features.

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Robert Dickinson, Jeff Forshaw, Ross Jenkinson, Peter Millington

Fri Sep 20 2024 12:00:00 (21 hours)

# 5.

arXiv:2409.12697v1 Announce Type: cross Abstract: We revisit the Unruh effect with a direct, probability-level calculation. We rederive the transition rate of a uniformly accelerating Unruh-DeWitt monopole detector coupled to a massive scalar field, from both the perspective of an inertial (Minkowski) observer and an accelerating (Rindler) observer. We show that, for a measurement at a finite time after the initial state is prepared, the two perspectives give the same transition rate. We show that an inertial detector in a thermal bath of Minkowski particles responds differently to the accelerated detector (which perceives a thermal bath of Rindler particles), except in the case of a massless field where there is agreement at all times. Finally, numerical results for the transition rate are presented and explained. We highlight the transient effects caused by forcing the field to initially be in the Minkowski vacuum state.

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Florian Neukart

Fri Sep 20 2024 12:00:00 (21 hours)

# 6.

arXiv:2409.12206v1 Announce Type: new Abstract: We propose a fundamental duality between the geometric properties of spacetime and the informational content of quantum fields. Specifically, we establish that the curvature of spacetime is directly related to the entanglement entropy of quantum states, with geometric invariants mapping to informational measures. This framework modifies Einstein’s field equations by introducing an informational stress-energy tensor derived from quantum entanglement entropy. Our findings have implications for black hole thermodynamics, cosmology, and quantum gravity, suggesting that quantum information fundamentally shapes the structure of spacetime. We incorporate this informational stress-energy tensor into Einstein’s field equations, leading to modified spacetime geometry, particularly in regimes of strong gravitational fields, such as near black holes. We compute corrections to Newton’s constant $G$ due to entanglement entropy contributions from various quantum fields and explore the consequences for black hole thermodynamics and cosmology. Our results indicate that quantum information plays a crucial role in gravitational dynamics, providing new insights into the nature of spacetime and potential solutions to long-standing challenges in quantum gravity.

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Thu Sep 19 2024 23:54:22 (1 day)

# 7.

Bielińska, Marta and Jacobs, Caspar (2024) A Philosophical Introduction to Hidden Symmetries in Physics. [Preprint]

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Thu Sep 19 2024 00:38:21 (2 days)

# 8.

Krátký, Matěj (2024) Physical Possibility of the Aharonov-Bohm Effect. [Preprint]

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Flavio Del Santo, Nicolas Gisin

Wed Sep 18 2024 12:00:00 (2 days)

# 9.

arXiv:2409.10601v1 Announce Type: cross Abstract: What is fundamentally quantum? We argue that most of the features, problems, and paradoxes — such as the measurement problem, the Wigner’s friend paradox and its proposed solutions, single particle nonlocality, and no-cloning — allegedly attributed to quantum physics have a clear classical analogue if one is to interpret classical physics as fundamentally indeterministic. What really characterizes quantum physics boils down only to phenomena that involve $\hbar$, i.e., incompatible observables.

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Christopher M. Graney

Wed Sep 18 2024 12:00:00 (2 days)

# 10.

arXiv:2409.11349v1 Announce Type: new Abstract: This paper provides an overview of recent historical research regarding scientifically-informed challenges to the idea that the stars are other suns orbited by other inhabited earths — an idea that came to be known as “the Plurality of Worlds”. Johannes Kepler in the seventeenth century, Jacques Cassini in the eighteenth, and William Whewell in the nineteenth each argued against “pluralism” based on what in their respective times was solid science. Nevertheless, pluralism remained popular despite these and other scientific challenges. This history will be of interest to the astronomical community so that it is better positioned to avoid difficulties should the historical trajectory of pluralism continue, especially as it persists in the popular imagination.

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Christopher M. Graney

Wed Sep 18 2024 12:00:00 (2 days)

# 11.

arXiv:2409.11331v1 Announce Type: new Abstract: In his 1616 discourse on the tides, Galileo claimed that diurnal tides occurred in Lisbon, Portugal, bolstering his theory of the tides. Lisbon does not feature such tides, but in an exchange of letters in 1629-1630, Giovanfrancesco Buonamici provided Galileo with information on where such tides could be found. Buonamici referred Galileo to the Regimiento de Navegaci\’on of Andr\’es Garc\’ia de C\’espedes, and to the Descrittione di Tutti i Paesi Bassi of Lodovico Guicciardini. Galileo omitted any information on where diurnal tides occurred from his 1632 Dialogue, perhaps unintentionally, leaving him open to criticism. Buonamici’s material militates against that criticism.

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Maximilian Schlosshauer

Tue Sep 17 2024 18:00:00 (3 days)

# 12.

Author(s): Maximilian Schlosshauer

We compare the performance of protective quantum measurements to that of standard projective measurements. Performance is quantified in terms of the uncertainty in the measured expectation value. We derive an expression for the relative performance of these two types of quantum measurements and show…

[Phys. Rev. A 110, 032215] Published Tue Sep 17, 2024

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R. A. Caetano and R. M. Angelo

Tue Sep 17 2024 18:00:00 (3 days)

# 13.

]]>Author(s): R. A. Caetano and R. M. Angelo

Based on (i) the physical principle of local causality and (ii) a certain notion of elements of reality, Einstein, Podolsky, and Rosen put forward an argument showing that physical instances may exist in which two noncommuting observables can be joint elements of the physical reality. Here, we intro…

[Phys. Rev. A 110, 032214] Published Tue Sep 17, 2024

In the well known Copenhagen interpretation of Quantum mechanics, advocated by N. Bohr, the physical objects and the experimental results can be described only in a macroscopic language, leaving any possible microscopic description as `unspeakable’. This point of view has been deepened by C. Rovelli in the `relational interpretation’ of Quantum mechanics. Most of the alternative interpretations, which try a detailed microscopic description of physical phenomena and of their evolution, have in common the explicit introduction of the wave function as the basic element of the theory. These interpretations require the notion of `quantum state’ as the fundamental concept of the theory, which is the typical `unspeakable’ physical element according to the Copenhagen interpretation. The two basic physical entities are intimately bound together by the integrity of the wave function. These interpretations are usually indicated as “realistic”. It is well known that the use of the wave function and its time evolution in the description of the physical processes leads unavoidably to some difficulties or so-called `paradoxes’. The measurement problem is at the center of these difficulties, mainly because it requires the introduction of the reduction process of the wave function, which is not included explicitly within the mathematical formalism of Quantum Mechanics. In this paper we build up and propose a model which goes beyond the standard formalism and which is able to solve the measurement problem and all the other difficulties which, in a way or in another, are related to it.

]]>It is shown that the probability density satisfies a hyperbolic equation of motion with the unique characteristic that in its many-particle form it contains derivatives acting at spatially remote regions. Based on this feature we explore inter-particle correlations and the relation between the quantum equilibrium condition and the permutation invariance of the probability density. Some remarks concerning the quantum to classical transition are also presented.

]]>A Vision for a Bohm-Style Theory of Quantum Electrodynamics |

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Roderich Tumulka

Fri Sep 13 2024 12:00:00 (1 day)

# 1.

arXiv:2409.07784v1 Announce Type: new Abstract: Despite many successes of quantum electrodynamics (QED), we do not presently have a good understanding of this field of physics. QED has all of the foundational problems that standard non-relativistic quantum mechanics has, and further ones in addition. I discuss some of these problems and some options for what a Bohm-style theory of QED, with an ontology in space and time, could look like. I also point out why the proposal made by Bohm himself in 1952 for QED is not quite convincing. Finally, I outline the kind of Bohm-type theory of QED that I would consider convincing, and report about recent progress toward this kind of theory.

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Gabriel Fernandez Ferrari, {\L}ukasz Rudnicki, Lucas Chibebe C\’eleri

Fri Sep 13 2024 12:00:00 (1 day)

# 2.

arXiv:2409.07676v1 Announce Type: new Abstract: Thermodynamics is based on a coarse-grained approach, from which its fundamental variables emerge, effectively erasing the complicate details of the microscopic dynamics within a macroscopic system. The strength of Thermodynamics lies in the universality provided by this paradigm. In contrast, quantum mechanics focuses on describing the dynamics of microscopic systems, aiming to make predictions about experiments we perform, a goal shared by all fundamental physical theories, which are often framed as gauge theories in modern physics. Recently, a gauge theory for quantum thermodynamics was introduced, defining gauge invariant work and heat, and exploring their connections to quantum phenomena. In this work, we extend that theory in two significant ways. First, we incorporate energy spectrum degeneracies, which were previously overlooked. Additionally, we define gauge-invariant entropy, exploring its properties and connections to other physical and informational quantities. This results in a complete framework for quantum thermodynamics grounded in the principle of gauge invariance. To demonstrate some implications of this theory, we apply it to well-known critical systems.

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M. S. Guimaraes, I. Roditi, S. P. Sorella

Fri Sep 13 2024 12:00:00 (1 day)

# 3.

arXiv:2409.07597v1 Announce Type: new Abstract: A pedagogical introduction to Bell’s inequality in Quantum Mechanics is presented. Several examples, ranging from spin $1/2$ to coherent and squeezed states are worked out. The generalization to Mermin’s inequalities and to GHZ states is also outlined.

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Laurens Walleghem, Y\`il\`e Y\=ing, Rafael Wagner, David Schmid

Fri Sep 13 2024 12:00:00 (1 day)

# 4.

arXiv:2409.07537v1 Announce Type: new Abstract: The Local Friendliness argument is an extended Wigner’s friend no-go theorem that provides strong constraints on the nature of reality — stronger even than those imposed by Bell’s theorem or by noncontextuality arguments. In this work, we prove a variety of connections between Local Friendliness scenarios and Kochen-Specker noncontextuality. Specifically, we first show how one can derive new Local Friendliness inequalities using known tools and results from the literature on Kochen-Specker noncontextuality. In doing so, we provide a new derivation for some of the facets of the Local Friendliness polytope, and we prove that this polytope is equal to the Bell polytope in a wide range of extended Wigner’s friend scenarios with multipartite agents and sequential measurements. We then show how any possibilistic Kochen-Specker argument can be mathematically translated into a related proof of the Local Friendliness no-go theorem. In particular, we construct a novel kind of Local Friendliness scenario where a friend implements several compatible measurements (or joint measurements of these) in between the superobserver’s operations on them. We illustrate this with the well-known 5-cycle and Peres-Mermin contextuality arguments.

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Fri Sep 13 2024 00:56:00 (1 day)

# 5.

March, Eleanor and Read, James (2024) A primer on Carroll gravity. [Preprint]

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Fri Sep 13 2024 00:53:38 (1 day)

# 6.

Callender, Craig (2023) Temporal Neutrality Implies Exponential Temporal Discounting. Philosophy of Science, 90 (5).

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Fri Sep 13 2024 00:52:22 (1 day)

# 7.

Callender, Craig (2024) Insights into Quantum Time Reversal from the Classical Schrödinger Equation. [Preprint]

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Fri Sep 13 2024 00:51:22 (1 day)

# 8.

Read, James (2024) Review of “Logic Meets Wigner’s Friend (and their Friends)”, by Alexandru Baltag and Sonja Smets. [Preprint]

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Fri Sep 13 2024 00:49:32 (1 day)

# 9.

Fortin, Sebastian and Pasqualini, Matias (2024) Emergence-Free Duality: Phonons and Vibrating Atoms in Crystalline Solids. [Preprint]

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Fri Sep 13 2024 00:48:34 (1 day)

# 10.

Gao, Shan (2024) Simplest Quantum Mechanics: Why It Is Better Than Bohmian, Everettian and Collapse Theories. [Preprint]

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Thu Sep 12 2024 01:00:21 (2 days)

# 11.

Broka, Chris A. (2024) Degenerate States and the Problem of Quantum Measurement. [Preprint]

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Thu Sep 12 2024 00:59:05 (2 days)

# 12.

Di Biagio, Andrea and Rovelli, Carlo (2024) On the Time Orientation of Probabilistic Theories. [Preprint]

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Wed Sep 11 2024 05:30:44 (3 days)

# 13.

Toader, Iulian Danut (2024) Weyl’s Quantifiers. [Preprint]

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Toby Peterken

Tue Sep 10 2024 12:00:00 (4 days)

# 14.

arXiv:2307.16531v2 Announce Type: replace Abstract: In this work, we attempt to define a notion of compositeness compatible with Quantum Field Theory. Considering the analytic properties of the S-matrix, we conclude that there is no satisfactory definition of compositeness compatible with Quantum Field Theory. Without this notion, one must claim that all bound states are equally fundamental, that is, one cannot rigorously claim that everyday objects are made of atoms or that atoms are made of protons and neutrons. I then show how an approximate notion of compositeness may be recovered in the regime where the mass of a bound state is close to a multi-particle threshold. Finally, we see that rejecting compositeness solves several of the “problems of everyday objects” encountered in an undergraduate metaphysics course.

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Emily Adlam

Tue Sep 10 2024 12:00:00 (4 days)

# 15.

arXiv:2409.05259v1 Announce Type: new Abstract: I distinguish between pure self-locating credences and superficially self-locating credences, and argue that there is never any rationally compelling way to assign pure self-locating credences. I first argue that from a practical point of view, pure self-locating credences simply encode our pragmatic goals, and thus pragmatic rationality does not dictate how they must be set. I then use considerations motivated by Bertrand’s paradox to argue that the indifference principle and other popular constraints on self-locating credences fail to be a priori principles of epistemic rationality, and I critique some approaches to deriving self-locating credences based on analogies to non-self-locating cases. Finally, I consider the implications of this conclusion for various applications of self-locating probabilities in scientific contexts, arguing that it may undermine certain kinds of reasoning about multiverses, the simulation hypothesis, and Boltzmann brains.

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Mario Bacelar Valente

Tue Sep 10 2024 12:00:00 (4 days)

# 16.

arXiv:2409.04450v1 Announce Type: new Abstract: With special relativity, we seem to be facing a conundrum. It is a very well-tested theory; in this way, the Minkowski spacetime must be “capturing” essential features of space and time. However, its geometry seems to be incompatible with any sort of global notion of time. We might only have local notions of now (present moment) and time flow, at best. In this note, we will explore the possibility that a pretty much global notion of now (and time flow) might be hiding in plain sight in the geometry of the Minkowski spacetime.

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Tue Sep 10 2024 00:42:41 (4 days)

# 17.

Wallace, David (2024) Real Patterns in Physics and Beyond. [Preprint]

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D V Red\v{z}i\’c

Mon Sep 09 2024 12:00:00 (5 days)

# 18.

arXiv:2404.19566v2 Announce Type: replace-cross Abstract: The complex relationship between Einstein’s second postulate and the Maxwell electromagnetic theory is elucidated. A simple deduction of the main results of the Ignatowski approach to the theory of relativity is given. The peculiar status of the principle of relativity among the Maxwellians is illustrated.

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Alejandro Cassini, Leonardo Levinas

Mon Sep 09 2024 12:00:00 (5 days)

# 19.

arXiv:2407.12960v2 Announce Type: replace Abstract: We elucidate how different theoretical assumptions bring about radically different interpretations of the same experimental result. We do this by analyzing special relativity as it was originally formulated. Then, we examine the relationship of the theory with the result of the Michelson and Morley experiment. We point out that in diverse a historical context the same experiment can be thought of as providing different conceptualizations of phenomena. This demonstrates why special relativity prevailed over its rival theories. This theory made a new reinterpretation of the experiment by associating it with a novel phenomenon, namely, the invariance of the speed of light, a phenomenon that was not the one originally investigated. This leads us to an understanding of how this experiment could have been interpreted in a completely different historical context.

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Leonardo Levinas

Mon Sep 09 2024 12:00:00 (5 days)

# 20.

arXiv:2304.06860v2 Announce Type: replace Abstract: In the famous thought experiment studied in this article, Galileo attempted to refute the Aristotelian hypothesis that heavier bodies should fall more quickly than lighter ones. After pointing out some inconsistencies in Galileo’s approach, we show, through the design of two alternative but equivalent experiments, that from his imaginary experiment, it is not possible to reach the conclusion that all bodies fall simultaneously. We show why, to explain the result of this type of experience, it is necessary to establish the equivalence between inertial and gravitational masses derived exclusively from experience.

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Aur\’elien Drezet

Mon Sep 09 2024 12:00:00 (5 days)

# 21.

arXiv:2409.04304v1 Announce Type: cross Abstract: In this work we analyze recent proposals by Das and D\”{u}rr (DD) to measure the arrival time distributions of quantum particles within the framework of de Broglie Bohm theory (or Bohmian mechanics). We also analyze the criticisms made by Goldstein Tumulka and Zangh\`{i} (GTZ) of these same proposals, and show that each protagonist is both right and wrong. In fine, we show that DD’s predictions are indeed measurable in principle, but that they will not lead to violations of the no-signalling theorem used in Bell’s theorem, in contradiction with some of Das and Maudlin’s hopes.

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Sun Sep 08 2024 00:44:32 (6 days)

# 22.

Vergouwen, Sanne and De Haro, Sebastian (2024) Supersymmetry in the Seiberg-Witten Theory: A Window into Quantum Field Theory. [Preprint]

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Sun Sep 08 2024 00:43:31 (6 days)

# 23.

Hashemi, Ataollah (2024) A Panpsychist Solution to the Exclusion Problem. Acta Analytica.

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Sun Sep 08 2024 00:41:53 (6 days)

# 24.

Elder, Jamee (2023) On the “Direct Detection” of Gravitational Waves. [Preprint]

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Sun Sep 08 2024 00:41:07 (6 days)

# 25.

Klein, Ulf (2024) Quantizing Galilean spacetime: a reconstruction of Maxwell’s equations in empty space. Quantum Stud. : Math. Found., 11. pp. 717-737.

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Ramon Jose C. Bagunu, Eric A. Galapon

Sat Sep 07 2024 12:00:00 (1 week)

# 26.

arXiv:2409.03348v1 Announce Type: new Abstract: One of the fundamental problems in quantum mechanics is finding the correct quantum image of a classical observable that would correspond to experimental measurements. We investigate for the appropriate quantization rule that would yield a Hamiltonian that obeys the quantum analogue of Hamilton’s equations of motion, which includes differentiation of operators with respect to another operator. To give meaning to this type of differentiation, Born and Jordan established two definitions called the differential quotients of first type and second type. In this paper we modify the definition for the differential quotient of first type and establish its consistency with the differential quotient of second type for different basis operators corresponding to different quantizations. Theorems and differentiation rules including differentiation of operators with negative powers and multiple differentiation were also investigated. We show that the Hamiltonian obtained from Weyl, simplest symmetric, and Born-Jordan quantization all satisfy the required algebra of the quantum equations of motion.

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Roland C. Farrell

Sat Sep 07 2024 12:00:00 (1 week)

# 27.

arXiv:2409.03123v1 Announce Type: new Abstract: The separation between physics at low and high energies is essential for physics to have any utility; the details of quantum gravity are not necessary to calculate the trajectory of a cannon ball. However, physics at low and high energies are not completely independent, and this thesis explores two ways that they are related. The first is through a UV/IR symmetry that relates scattering processes at low and high energies. This UV/IR symmetry manifests in geometrical properties of the $S$-matrix, and of the RG flow of the coupling constants in the corresponding effective field theory. Low energy nuclear physics nearly realizes this UV/IR symmetry, providing an explanation for the smallness of shape parameters in the effective range expansion of nucleon-nucleon scattering, and inspiring a new way to organize the interactions between neutrons and protons. The second is through the use of quantum computers to simulate lattice gauge theories. Quantum simulations rely on the universality of the rules of quantum mechanics, which can be applied equally well to describe a (low energy) transmon qubit at 15 milli-Kelvin as a (high energy) 1 TeV quark. This thesis presents the first simulations of one dimensional lattice quantum chromodynamics on a quantum computer, culminating in a real-time simulation of beta-decay. Results from the first simulations of a lattice gauge theory on 100+ qubits of a quantum computer are also presented. The methods developed in this thesis for quantum simulation are “physics-aware”, and are guided by the symmetries and hierarchies in length scales of the systems being studied. Without these physics-aware methods, 100+ qubit simulations of lattice gauge theories would not have been possible on the noisy quantum computers that are presently available.

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Miguel Gallego, Borivoje Daki\’c

Sat Sep 07 2024 12:00:00 (1 week)

# 28.

arXiv:2409.03001v1 Announce Type: new Abstract: The quantum description of the microscopic world is incompatible with the classical description of the macroscopic world, both mathematically and conceptually. Nevertheless, it is generally accepted that classical mechanics emerges from quantum mechanics in the macroscopic limit. In this letter, we challenge this perspective and demonstrate that the behavior of a macroscopic system can retain all aspects of the quantum formalism, in a way that is robust against decoherence, particle losses and coarse-grained (imprecise) measurements. This departure from the expected classical description of macroscopic systems is not merely mathematical but also conceptual, as we show by the explicit violation of a Bell inequality and a Leggett-Garg inequality.

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Yuxi Liu

Sat Sep 07 2024 12:00:00 (1 week)

# 29.

arXiv:2409.02962v1 Announce Type: new Abstract: We present a geometrical way of understanding the dynamics of wavefunctions in a free space, using the phase-space formulation of quantum mechanics. By visualizing the Wigner function, the spreading, shearing, the so-called “negative probability flow” of wavefunctions, and the long-time asymptotic dispersion, are intuited visually. These results are not new, but previous derivations were analytical, whereas this paper presents elementary geometric arguments that are almost “proofs without words”, and suitable for a first course in quantum mechanics.

]]>Derivation of a Schrödinger Equation for Single Neurons Through Stochastic Neural Dynamics

Despite the prevalent view that quantum mechanics is irrelevant to macroscopic biological systems because of inherent noise and decoherence, this paper demonstrates that the electrical noise (Brownian motion) in neuron membranes gives rise to an `emergent’ Schrödinger equation involving a new neuronal constant ℏ^, fundamentally challenging the standard view of neuronal behaviour. This result could provide new insights into the underlying mechanisms of brain function, thus challenging existing paradigms in both quantum physics and neuroscience. A possible empirical test of this emergent quantum behaviour would be to look for quantum fluctuations in subthreshold neural oscillations.

arXiv:2406.16991 [q-bio.NC]

]]>For almost 75 years, the general solution for the Schrödinger equation was assumed to be generated by a time-ordered exponential known as the Dyson series. We discuss under which conditions the unitarity of this solution is broken, and additional singular dynamics emerges. Then, we provide an alternative construction that is manifestly unitary, regardless of the choice of the Hamiltonian, and study various aspects of the implications. The new construction involves an additional self-adjoint operator that might evolve in a non-gradual way. Its corresponding dynamics for gauge theories exhibit the behavior of a collective object governed by a singular Liouville’s equation that performs transitions at a measure 0 set. Our considerations show that Schrödinger’s and Liouville’s equations are, in fact, two sides of the same coin, and together they become the unified description of quantum systems.

arXiv:2402.18499

[quant-ph]Comments are welcome and can be sent to the author directly.

Black hole singularity resolution from unitarity |

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Steffen Gielen, Luc\’ia Men\’endez-Pidal

Fri Sep 06 2024 12:00:00 (20 hours)

# 1.

arXiv:2409.03006v1 Announce Type: cross Abstract: We study the quantum dynamics of an interior planar AdS (anti-de Sitter) black hole, requiring unitarity in the natural time coordinate conjugate to the cosmological “constant of motion” appearing in unimodular gravity. Both the classical singularity and the horizon are replaced by a non-singular highly quantum region; semiclassical notions of spacetime evolution are only valid in an intermediate region. For the singularity, our results should be applicable to general black holes: unitarity in unimodular time always implies singularity resolution.

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G. E. Volovik

Fri Sep 06 2024 12:00:00 (20 hours)

# 2.

arXiv:2409.03316v1 Announce Type: new Abstract: It is shown that the temperatures which characterise the Unruh effect, the Gibbons-Hawking radiation from the de Sitter cosmological horizon and the Hawking radiation from the black hole horizon acquire the extra factor 2 compared with their traditional values. The reason for that is the coherence of different processes. The combination of the coherent processes also allows us to make the connection between the Schwinger pair production and the Unruh effect.

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Ramon Jose C. Bagunu, Eric A. Galapon

Fri Sep 06 2024 12:00:00 (20 hours)

# 3.

arXiv:2409.03348v1 Announce Type: new Abstract: One of the fundamental problems in quantum mechanics is finding the correct quantum image of a classical observable that would correspond to experimental measurements. We investigate for the appropriate quantization rule that would yield a Hamiltonian that obeys the quantum analogue of Hamilton’s equations of motion, which includes differentiation of operators with respect to another operator. To give meaning to this type of differentiation, Born and Jordan established two definitions called the differential quotients of first type and second type. In this paper we modify the definition for the differential quotient of first type and establish its consistency with the differential quotient of second type for different basis operators corresponding to different quantizations. Theorems and differentiation rules including differentiation of operators with negative powers and multiple differentiation were also investigated. We show that the Hamiltonian obtained from Weyl, simplest symmetric, and Born-Jordan quantization all satisfy the required algebra of the quantum equations of motion.

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Roland C. Farrell

Fri Sep 06 2024 12:00:00 (20 hours)

# 4.

arXiv:2409.03123v1 Announce Type: new Abstract: The separation between physics at low and high energies is essential for physics to have any utility; the details of quantum gravity are not necessary to calculate the trajectory of a cannon ball. However, physics at low and high energies are not completely independent, and this thesis explores two ways that they are related. The first is through a UV/IR symmetry that relates scattering processes at low and high energies. This UV/IR symmetry manifests in geometrical properties of the $S$-matrix, and of the RG flow of the coupling constants in the corresponding effective field theory. Low energy nuclear physics nearly realizes this UV/IR symmetry, providing an explanation for the smallness of shape parameters in the effective range expansion of nucleon-nucleon scattering, and inspiring a new way to organize the interactions between neutrons and protons. The second is through the use of quantum computers to simulate lattice gauge theories. Quantum simulations rely on the universality of the rules of quantum mechanics, which can be applied equally well to describe a (low energy) transmon qubit at 15 milli-Kelvin as a (high energy) 1 TeV quark. This thesis presents the first simulations of one dimensional lattice quantum chromodynamics on a quantum computer, culminating in a real-time simulation of beta-decay. Results from the first simulations of a lattice gauge theory on 100+ qubits of a quantum computer are also presented. The methods developed in this thesis for quantum simulation are “physics-aware”, and are guided by the symmetries and hierarchies in length scales of the systems being studied. Without these physics-aware methods, 100+ qubit simulations of lattice gauge theories would not have been possible on the noisy quantum computers that are presently available.

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Miguel Gallego, Borivoje Daki\’c

Fri Sep 06 2024 12:00:00 (20 hours)

# 5.

arXiv:2409.03001v1 Announce Type: new Abstract: The quantum description of the microscopic world is incompatible with the classical description of the macroscopic world, both mathematically and conceptually. Nevertheless, it is generally accepted that classical mechanics emerges from quantum mechanics in the macroscopic limit. In this letter, we challenge this perspective and demonstrate that the behavior of a macroscopic system can retain all aspects of the quantum formalism, in a way that is robust against decoherence, particle losses and coarse-grained (imprecise) measurements. This departure from the expected classical description of macroscopic systems is not merely mathematical but also conceptual, as we show by the explicit violation of a Bell inequality and a Leggett-Garg inequality.

from

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Yuxi Liu

Fri Sep 06 2024 12:00:00 (20 hours)

# 6.

arXiv:2409.02962v1 Announce Type: new Abstract: We present a geometrical way of understanding the dynamics of wavefunctions in a free space, using the phase-space formulation of quantum mechanics. By visualizing the Wigner function, the spreading, shearing, the so-called “negative probability flow” of wavefunctions, and the long-time asymptotic dispersion, are intuited visually. These results are not new, but previous derivations were analytical, whereas this paper presents elementary geometric arguments that are almost “proofs without words”, and suitable for a first course in quantum mechanics.

from

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Julian De Vuyst

Fri Sep 06 2024 12:00:00 (20 hours)

# 7.

arXiv:2012.05617v2 Announce Type: replace Abstract: A well-known topic within the philosophy of physics is the problem of fine-tuning: the fact that the universal constants seem to take non-arbitrary values in order for live to thrive in our Universe. In this paper we will talk about this problem in general, giving some examples from physics. We will review some solutions like the design argument, logical probability, cosmological natural selection, etc. Moreover, we will also discuss why it’s dangerous to uphold the Principle of Naturalness as a scientific principle. After going through this paper, the reader should have a general idea what this problem exactly entails whenever it is mentioned in other sources and we recommend the reader to think critically about these concepts.

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Bekir Bayta\c{s}, Ozan Ekin Derin

Thu Sep 05 2024 12:00:00 (1 day)

# 8.

arXiv:2409.02487v1 Announce Type: new Abstract: This brief brochure is intended to present a philosophical theory known as relational materialism. We introduce the postulates and principles of the theory, articulating its ontological and epistemological content using the language of category theory. The identification of any existing entity is primarily characterized by its relational, finite, and non-static nature. Furthermore, we provide a categorical construction of particularities within the relational materialist onto-epistemology. Our objective is to address and transform a specific perspective prevalent in scientific communities into a productive network of philosophical commitments.

from

Thu Sep 05 2024 03:07:07 (2 days)

# 9.

Rodin, Andrei (2024) Does Identity Have Sense? [Preprint]

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Daniel Grimmer

Wed Sep 04 2024 12:00:00 (2 days)

# 10.

arXiv:2306.08110v2 Announce Type: replace Abstract: Spacetime dualities arise whenever two theories — despite being structurally equivalent in some sense — seemingly provide us with two radically different spatiotemporal descriptions of the world. This often involves radical differences in how the two theories topologically stage their states; Whereas one theory is about *this* type of particle/field on *this* smooth manifold, the other theory is about *that* type of particle/field arranged differently on *that* smooth manifold. For instance, the AdS-CFT correspondence relates a certain theory set in the bulk (our 3+1 dimensional spacetime) to another theory set on the boundary (a 2+1 dimensional spacetime). Another example (new in this paper) is the M\”{o}bius-Euclid duality: a theory about a certain type of particle floating around on the Euclidean plane can be topologically redescribed as instead being about a different type of particle living on a M\”{o}bius strip, and vice versa. The possibility of such alternative spacetime framings raises some significant questions about the epistemology and metaphysics of space and time. For instance, what are our topology selection criteria? Are they objective or conventional? Moreover, given that two spacetime theories are topological redescriptions of each other, what is the common core which they are equivalent descriptions of? As a step towards answering such questions, this paper develops a general framework (spacetime representation theory) for understanding our ability to topologically redescribe our spacetime theories. With this framework established, I will then discuss the ISE Equivalence Theorem which sets the scope of the recently developed ISE Method of topological redescription.

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C. Baumgarten

Wed Sep 04 2024 12:00:00 (2 days)

# 11.

arXiv:2409.01946v1 Announce Type: cross Abstract: It is demonstrated that energy conservation allows for a “heuristic” derivation of Newtonian mechanics, if the energy is presumed to be an additive function of position and velocity. It is shown that energy must be depicted as a function of position and momentum in order to allow for the correct relativistic equations. Accordingly it is argued that not only quantum theory but also special relativity is intrinsically Hamiltonian and requires a description by coordinates and momenta instead of coordinates and velocities. Furthermore it is argued that the usual historical order of the “formulations” of mechanics, from Newtonian via Lagrangian to Hamiltonian mechanics, is illogical and misleading. Therefore it should be reversed.

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Wed Sep 04 2024 01:27:18 (3 days)

# 12.

Norton, John D. (2024) The Large-Scale Structure of Inductive Inference. BSPSopen . University of Calgary Press/BSPSopen, Calgary. ISBN 978-1-77385-541-7

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Wed Sep 04 2024 01:23:43 (3 days)

# 13.

Woodward, James (2024) Explanation, Truth and Structural Realism. [Preprint]

from

Wed Sep 04 2024 01:21:13 (3 days)

# 14.

Gambini, Rodolfo and Pullin, Jorge (0024) Quantum panprotopsychism and the structure and subject-summing combination problem. [Preprint]

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Patrick Emonts, Mengyao Hu, Albert Aloy, and Jordi Tura

Tue Sep 03 2024 18:00:00 (3 days)

# 15.

Author(s): Patrick Emonts, Mengyao Hu, Albert Aloy, and Jordi Tura

Bell nonlocality is the resource that enables device-independent quantum information processing tasks. It is revealed through the violation of so-called Bell inequalities, indicating that the observed correlations cannot be reproduced by any local hidden-variable model. While well explored in few-bo…

[Phys. Rev. A 110, 032201] Published Tue Sep 03, 2024

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Sun Sep 01 2024 15:21:57 (5 days)

# 16.

Bamonti, Nicola (2024) What is a reference frame in General Relativity? [Preprint]

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Sat Aug 31 2024 12:21:25 (6 days)

# 17.

]]>Gambini, Rodolfo and Pullin, Jorge (2024) Quantum panprotopsychism and the combination problem. Mind and Matter, 22 (1). pp. 51-94. ISSN 1611-8812

Magic of the Heisenberg Picture |

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Neil Dowling, Pavel Kos, Xhek Turkeshi

Fri Aug 30 2024 12:00:00 (21 hours)

# 1.

arXiv:2408.16047v1 Announce Type: new Abstract: Magic quantifies the non-Clifford operations required for preparing a state on quantum processors and sets bounds on the classical computational complexity of simulating quantum dynamics. We study a magic resource theory for operators, which is dual to that describing states. We identify that the stabilizer R\’enyi entropy analog in operator space is a good magic monotone satisfying the usual conditions, while inheriting efficient computability properties and providing a tight lower-bound to the minimum number of non-Clifford gates in a circuit. It is operationally well-defined as quantifying how well one can approximate an operator with one that has only few Pauli strings; analogous to the relation between entanglement entropy and tensor-network truncation. An immediate advantage is that the operator stabilizer entropies exhibit inherent locality through a Lieb-Robinson bound, making them particularly suited for studying local dynamic magic generation in many-body systems. We compute this quantity analytically in two distinct regimes. First, we show that random evolution or circuits typically have approximately maximal magic in the Heisenberg picture for all R\’enyi indices, and evaluate the Page correction. Second, harnessing both dual unitarity and ZX graphical calculus, we compute the operator stabilizer entropy evolution for an interacting integrable XXZ circuit. In this case, magic quickly saturates to a constant; a distinct Heisenberg picture phenomena and suggestive of a connection to integrability. We argue that this efficiently computable operator magic monotone reveals structural properties of many-body magic generation, and can inspire novel Clifford-assisted tensor network methods.

from

Fri Aug 30 2024 01:56:40 (1 day)

# 2.

Toader, Iulian Danut (2024) Weyl’s Quantifiers. [Preprint]

from

Thu Aug 29 2024 17:04:20 (1 day)

# 3.

Christian, Joy (2024) Bell’s Theorem Begs the Question. [Preprint]

from

Thu Aug 29 2024 16:09:54 (1 day)

# 4.

Christian, Joy (2024) Comment on the GHZ variant of Bell’s theorem without inequalities. [Preprint]

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Philippe Grangier, Alexia Auffeves, Nayla Farouki, Mathias Van Den Bossche, Olivier Ezratty

Thu Aug 29 2024 12:00:00 (1 day)

# 5.

arXiv:2406.05169v2 Announce Type: replace Abstract: The purpose of this article is to provide a novel approach and justification of the idea that classical physics and quantum physics can neither function nor even be conceived one without the other – in line with ideas attributed to e.g. Niels Bohr or Lev Landau. Though this point of view may go against current common wisdom, we will show that it perfectly fits with empirical evidence, and can be maintained without giving up physical realism. In order to place our arguments in a convenient historical perspective, we will proceed as if we were following the path of a police investigation, about the demise, or vanishing, of some valuable properties of the two electrons in the helium atom. We will start from experimentally based evidence in order to analyse and explain physical facts, moving cautiously from a classical to a quantum description, without mixing them up. The overall picture will be that the physical properties of microscopic systems are quantized, as initially shown by Planck and Einstein, and they are also contextual, i.e. that they can be given a physical sense only by embedding a microscopic system within a macroscopic measurement context.

from

Thu Aug 29 2024 01:42:04 (2 days)

# 6.

Binder, Bernd (2024) (Split-)Quaternion and (Split-)Octonion Dynamics in Discrete-Time Recurrent Frenet Frames. [Preprint]

from

Wed Aug 28 2024 15:35:51 (2 days)

# 7.

Bradley, Clara (2024) The Extended Hamiltonian Is Not Trivial. [Preprint]

from

Wed Aug 28 2024 15:35:41 (2 days)

# 8.

Bradley, Clara (2024) The Relationship Between Lagrangian and Hamiltonian Mechanics: The Irregular Case. [Preprint]

from

Wed Aug 28 2024 15:35:30 (2 days)

# 9.

Bradley, Clara (2024) Do First-Class Constraints Generate Gauge Transformations? A Geometric Resolution. [Preprint]

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Ted Jacobson

Wed Aug 28 2024 12:00:00 (2 days)

# 10.

arXiv:2408.15070v1 Announce Type: new Abstract: In 1947, four months before the famous Shelter Island conference, Richard Feynman wrote a lengthy letter to his former MIT classmate Theodore Welton, reporting on his efforts to develop a path integral describing the propagation of a Dirac particle. While these efforts never came to fruition, and were shortly abandoned in favor of a very different method of dealing with the electron propagator appearing in in QED, the letter is interesting both from the historical viewpoint of revealing what Feynman was thinking about during that period just before the development of QED, and for its scientific ideas. It also contains at the end some philosophical remarks, which Feynman wraps up with the comment, “Well enough for the baloney.” In this article I present a transcription of the letter along with editorial notes, and a facsimile of the original handwritten document. I also briefly comment on Feynman’s efforts and discuss their relation to some later work.

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Geoffrey W. Marcy

Tue Aug 27 2024 12:00:00 (3 days)

# 11.

arXiv:2408.13427v1 Announce Type: cross Abstract: This is a review and statistical analysis of the evidence supporting the existence of a cosmological constant in the early 1990s, before its discovery made with distant supernovae in 1998. The earlier evidence was derived from newly precise measurements of the Universe, including its mass density, the Hubble constant, the age of the oldest stars, the filamentary large-scale structure, and the anisotropy of the cosmic microwave background. These measurements created tension for models assuming the cosmological constant was zero. This tension was alleviated by several insightful papers published before 1996, which proposed a cosmological constant that increased the expansion rate. Statistical analysis here shows that the probability of the cosmological constant being zero was demonstrably less than a few percent. Some models identified a best-fit value close to the modern estimate of Omega_Lambda ~ 0.7.

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Tue Aug 27 2024 03:10:42 (4 days)

# 12.

Negro, Niccolo and Hohwy, Jakob and Corcoran, Andrew and Mudrik, Liad (2024) The Philosophy of Science of Consciousness Science. [Preprint]

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Tue Aug 27 2024 02:53:13 (4 days)

# 13.

Chen, Lu and March, Eleanor and Read, James (2024) Equivalence, reduction, and sophistication in teleparallel gravity. [Preprint]

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E. E. Perepelkin, B. I. Sadovnikov, N. G. Inozemtseva, and P. V. Afonin

Mon Aug 26 2024 18:00:00 (4 days)

# 14.

]]>Author(s): E. E. Perepelkin, B. I. Sadovnikov, N. G. Inozemtseva, and P. V. Afonin

Using the Wigner-Vlasov formalism, an exact three-dimensional solution of the Schrödinger equation for a scalar particle in an electromagnetic field is constructed. Electric and magnetic fields are nonuniform. According to the exact expression for the wave function, the search for two types of Wigne…

[Phys. Rev. A 110, 022224] Published Mon Aug 26, 2024

A theory of time based on wavefunction collapse |

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Sung-Sik Lee

Fri Aug 23 2024 12:15:38 (21 hours)

# 1.

arXiv:2408.11905v1 Announce Type: new Abstract: We propose that moments of time arise through the failed emergence of the temporal diffeomorphism as gauge symmetry, and that the passage of time is a continual process of an instantaneous state collapsing toward a gauge-invariant state. Unitarity and directedness of the resulting time evolution are demonstrated for a minisuperspace model of cosmology.

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V. Vilasini and Renato Renner

Thu Aug 22 2024 18:00:00 (1 day)

# 2.

Author(s): V. Vilasini and Renato Renner

In order for quantum processes with indefinite causal order to be realized on a classical spacetime, the inputs and outputs cannot be localized in spacetime.

[Phys. Rev. Lett. 133, 080201] Published Thu Aug 22, 2024

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Philipp Berghofer

Thu Aug 22 2024 12:02:18 (1 day)

# 3.

arXiv:2408.11705v1 Announce Type: new Abstract: There is noticeable consensus among physicists and philosophers that only gauge-invariant quantities can be physically real. However, this insight that physical quantities must be gauge-invariant is not well-reflected in standard approaches to particle physics. For instance, each and every elementary field/particle of the Standard Model fails to be gauge-invariant! The main objective of this paper is to offer an accessible, concise, and convincing analysis of why philosophers and physicists should devote more of their energy to working on gauge-invariant approaches. Correspondingly, the thesis of this paper is that pursuing gauge-invariant approaches has several virtues. For instance, gauge-invariant reformulations allow us to make particle physics consistent with the mathematical framework in which it is formulated. This is illustrated by how mathematical theorems such as Elitzur’s theorem, the Gribov ambiguity, and Haag’s theorem pose problems for standard approaches but are avoided by gauge-invariant approaches.

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Andrei Constantin, Deaglan Bartlett, Harry Desmond, Pedro G. Ferreira

Thu Aug 22 2024 12:02:17 (1 day)

# 4.

arXiv:2408.11065v1 Announce Type: cross Abstract: Physics, as a fundamental science, aims to understand the laws of Nature and describe them in mathematical equations. While the physical reality manifests itself in a wide range of phenomena with varying levels of complexity, the equations that describe them display certain statistical regularities and patterns, which we begin to explore here. By drawing inspiration from linguistics, where Zipf’s law states that the frequency of any word in a large corpus of text is roughly inversely proportional to its rank in the frequency table, we investigate whether similar patterns for the distribution of operators emerge in the equations of physics. We analyse three corpora of formulae and find, using sophisticated implicit-likelihood methods, that the frequency of operators as a function of their rank in the frequency table is best described by an exponential law with a stable exponent, in contrast with Zipf’s inverse power-law. Understanding the underlying reasons behind this statistical pattern may shed light on Nature’s modus operandi or reveal recurrent patterns in physicists’ attempts to formalise the laws of Nature. It may also provide crucial input for symbolic regression, potentially augmenting language models to generate symbolic models for physical phenomena. By pioneering the study of statistical regularities in the equations of physics, our results open the door for a meta-law of Nature, a (probabilistic) law that all physical laws obey.

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Henrique Gomes, Tushar Menon, Oliver Pooley, James Read

Wed Aug 21 2024 12:39:41 (2 days)

# 5.

arXiv:2408.10674v1 Announce Type: new Abstract: We show that the geometric structure of an arbitrary relativistic spacetime can be determined by the transformation groups associated with a collection of privileged coordinate systems.

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Pascal Marquet, Max Planck

Tue Aug 20 2024 14:56:35 (3 days)

# 6.

arXiv:2408.10023v1 Announce Type: new Abstract: An English (2024) translation (v1) by P. Marquet of the Max Planck’s 1911 paper “Energy and temperature” published first in French (“Energie et temp\’erature”, J. Phys. Theor. Appl., 1 (1), p.345-359) and then in German (“Energie und Temperatur”, Phys. Z., 12 (16), p.681-687).

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Sun Aug 18 2024 18:07:56 (5 days)

# 7.

Manchak, JB and Barrett, Thomas William (2024) Heraclitus-Maximal Worlds. [Preprint]

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Sun Aug 18 2024 18:07:26 (5 days)

# 8.

Lewis, Peter (2024) A dilemma for relational quantum mechanics. [Preprint]

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Sun Aug 18 2024 03:01:28 (6 days)

# 9.

]]>Viglione, Federico (2024) The Traversal of the Infinite: Considering a Beginning for an Infinite Past. [Preprint]