How the Michelson and Morley experiment was reinterpreted by special relativity |

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Alejandro Cassini, Leonardo Levinas

Fri Jul 19 2024 12:26:11 (23 hours)

# 1.

arXiv:2407.12960v1 Announce Type: new 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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Carlo Rovelli, David Wolpert

Fri Jul 19 2024 12:26:10 (23 hours)

# 2.

arXiv:2407.13197v1 Announce Type: new Abstract: Are you, with your perceptions, memories and observational data, a Boltzmann brain, namely a fleeting statistical fluctuation out of the thermal equilibrium of the universe? Arguments are given in the literature claiming that this bizarre hypothesis needs to be considered seriously, that all of our data about the past is actually a mirage. We point to a difficulty in these arguments. They are based on the dynamical laws and on statistical arguments, but they disregard the fact that we infer the dynamical laws presupposing the reliability of our data records about the past. Hence the reasoning in favor of the Boltzmann brain hypothesis contradicts itself, relying on the reliability of our data about the past to conclude that that data is wrong. More broadly, it is based on incomplete evidence. Incomplete evidence notoriously leads to false conclusions.

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Taha Sochi

Fri Jul 19 2024 12:26:09 (23 hours)

# 3.

arXiv:2407.13697v1 Announce Type: cross Abstract: In this article we pay tribute to Herbert Dingle for his early call to re-assess special relativity from philosophical and logical perspectives. However, we disagree with Dingle about a number of issues particularly his failure to distinguish between the scientific essence of special relativity (as represented by the experimentally-supported Lorentz transformations and their formal implications and consequences which we call “the mechanics of Lorentz transformations”) and the logically inconsistent interpretation of Einstein (which is largely based on the philosophical and epistemological views of Poincare). We also disagree with him about his manner and attitude which he adopted in his campaign against special relativity although we generally agree with him about the necessity of impartiality of the scientific community and the scientific press towards scientific theories and opinions as well as the necessity of total respect to the ethics of science and the rules of moral conduct in general.

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Jonte R. Hance, James Ladyman, John Rarity

Fri Jul 19 2024 12:26:08 (23 hours)

# 4.

arXiv:2204.03374v3 Announce Type: replace-cross Abstract: We explore how one might detect the dynamical quantum Cheshire cat proposed by Aharonov et al. We show that, in practice, we need to bias the initial state by adding/subtracting a small probability amplitude (`field’) of the orthogonal state, which travels with the disembodied property, to make the effect detectable (i.e. if our initial state is $|\uparrow_z\rangle$, we need to bias this with some small amount $\delta$ of state $|\downarrow_z\rangle$). This biasing, which can be done either directly or via weakly entangling the state with a pointer, effectively provides a phase reference with which we can measure the evolution of the state. The outcome can then be measured as a small probability difference in detections in a mutually unbiased basis, proportional to this biasing $\delta$. We show this is different from counterfactual communication, which provably does not require any probe field to travel between sender Bob and receiver Alice for communication. We further suggest an optical polarisation experiment where these phenomena might be demonstrated in a laboratory.

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Pasquale Bosso

Fri Jul 19 2024 12:26:00 (23 hours)

# 5.

arXiv:2407.13235v1 Announce Type: new Abstract: Phenomenological models of quantum gravity often consider the existence of some form of minimal length. This feature is commonly described in the context of quantum mechanics and using the corresponding formalism and techniques. Although few attempts at a quantum field-theoretical description of a minimal length has been proposed, they are rather the exception and there is no general agreement on the correct one. Here, using the quantum-mechanical model as a guidance, we propose a first-principle definition of a quantum field theory including a minimal length. Specifically, we propose a two-step procedure, by first describing the quantum-mechanical models as a classical field theory and subsequently quantizing it. We are thus able to provide a foundation for further exploration of the implications of a minimal length in quantum field theory.

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Tue Jul 16 2024 17:58:51 (3 days)

# 6.

Gao, Shan (2024) On the reality of the quantum state once again: A no-go theorem for psi-ontic models? Foundations of Physics, 54 (52).

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Tue Jul 16 2024 17:58:12 (3 days)

# 7.

Ladyman, James and Thebault, Karim P Y (2024) Open Systems and Autonomy. [Preprint]

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Tue Jul 16 2024 17:56:51 (3 days)

# 8.

Gao, Shan (2024) Does Locality Imply Reality of the Wave Function? Hardy’s Theorem Revisited. Foundations of Physics, 54 (44).

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Fernando Quevedo

Tue Jul 16 2024 12:49:28 (3 days)

# 9.

arXiv:2407.10033v1 Announce Type: new Abstract: My personal recollections are presented regarding my interactions with Steven Weinberg and the impact he had in my career from when I was his graduate student until the present.

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Wouter van der Wijngaart

Tue Jul 16 2024 12:49:27 (3 days)

# 10.

arXiv:2407.09567v1 Announce Type: cross Abstract: This Perspective explores the origins and persistence of recurrent structures and patterns throughout the known Universe. We start with a first fundamental question: 1. Considering that all information consists of patterns in physical structure but not all physical patterns constitute information, what is the fundamental relation between these two? We first explore the materialistic nature of structures and information, detailing how they can form through spontaneous or templated processes and evolve into complex structures, including self-replicators. We posit that all recurring structures emerge either spontaneously de novo or based on underlying information. A main implication is that all information must be understood as both a product and a driver of evolution. We further observe that the three carriers of information underpin the emergence of three main layers of self-organisation: genes coded in DNA for the biological layer, ideas stored in neural structure for the cultural layer, and records written on innate objects for the civilisation layer. This gives rise to two additional questions, which we subsequently address: 2. What can we anticipate about the future development of self-organizing layers given the role of information in their emergence? 3. What is the universality of information and its evolution throughout the Universe? This manuscript aims to offer a fresh perspective and a universal framework for information and the origin of structures by extending and unifying concepts from physics, biology, and information theory.

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Reinhard Folk, Yurij Holovatch

Tue Jul 16 2024 12:49:26 (3 days)

# 11.

]]>arXiv:2405.05703v2 Announce Type: replace Abstract: Today, the Ising model is an archetype describing collective ordering processes. And, as such, it is widely known in physics and far beyond. Less known is the fact that the thesis defended by Ernst Ising 100 years ago (in 1924) contained not only the solution of what we call now the `classical 1D Ising model’ but also other problems. Some of these problems, as well as the method of their solution, are the subject of this note. In particular, we discuss the combinatorial method Ernst Ising used to calculate the partition function for a chain of elementary magnets. In the thermodynamic limit, this method leads to the result that the partition function is given by the roots of a certain polynomial. We explicitly show that `Ising’s roots’ that arise within the combinatorial treatment are also recovered by the eigenvalues of the transfer matrix, a concept that was introduced much later. Moreover, we discuss the generalization of the two-state model to a three-state one presented in Ising’s thesis, but not included in his famous paper of 1925 (E. Ising, Z.Physik 31 (1925) 253). The latter model can be considered as a forerunner of the now abundant models with many-component order parameters.

Traveling time in a spacetime-symmetric extension of nonrelativistic quantum mechanics |

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Arlans J. S. de Lara and Marcus W. Beims

Fri Jul 12 2024 18:00:00 (15 hours)

# 1.

Author(s): Arlans J. S. de Lara and Marcus W. Beims

Time continues to be an intriguing physical property in the modern era. On the one hand, we have the classical and relativistic notion of time, where space and time have the same hierarchy, essential in describing events in spacetime. On the other hand, in quantum mechanics, time appears as a classi…

[Phys. Rev. A 110, 012216] Published Fri Jul 12, 2024

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Hui-Nan Wu, Yu-Huai Li, Bo Li, Xiang You, Run-Ze Liu, Ji-Gang Ren, Juan Yin, Chao-Yang Lu, Yuan Cao, Cheng-Zhi Peng, and Jian-Wei Pan

Fri Jul 12 2024 18:00:00 (15 hours)

# 2.

Author(s): Hui-Nan Wu, Yu-Huai Li, Bo Li, Xiang You, Run-Ze Liu, Ji-Gang Ren, Juan Yin, Chao-Yang Lu, Yuan Cao, Cheng-Zhi Peng, and Jian-Wei Pan

The emergence of quantum mechanics and general relativity has transformed our understanding of the natural world significantly. However, integrating these two theories presents immense challenges, and their interplay remains untested. Recent theoretical studies suggest that the single-photon interfe…

[Phys. Rev. Lett. 133, 020201] Published Fri Jul 12, 2024

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Fri Jul 12 2024 16:10:00 (16 hours)

# 3.

Chua, Eugene Y. S. (2024) The Time in Thermal Time. [Preprint]

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Fri Jul 12 2024 16:09:08 (16 hours)

# 4.

Rovelli, Carlo (2024) Princeton seminars on physics and philosophy. [Preprint]

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Florian Meier, Yuri Minoguchi, Simon Sundelin, Tony J. G. Apollaro, Paul Erker, Simone Gasparinetti, Marcus Huber

Fri Jul 12 2024 12:24:26 (20 hours)

# 5.

arXiv:2407.07948v1 Announce Type: new Abstract: Physical devices operating out of equilibrium are inherently affected by thermal fluctuations, limiting their operational precision. This issue is pronounced at microscopic and especially quantum scales and can only be mitigated by incurring additional entropy dissipation. Understanding this constraint is crucial for both fundamental physics and technological design. For instance, clocks are inherently governed by the second law of thermodynamics and need a thermodynamic flux towards equilibrium to measure time, which results in a minimum entropy dissipation per clock tick. Classical and quantum models and experiments often show a linear relationship between precision and dissipation, but the ultimate bounds on this relationship are unknown. Our theoretical discovery presents an extensible quantum many-body system that achieves clock precision scaling exponentially with entropy dissipation. This finding demonstrates that coherent quantum dynamics can surpass the traditional thermodynamic precision limits, potentially guiding the development of future high-precision, low-dissipation quantum devices.

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Lihong V. Wang

Fri Jul 12 2024 12:24:17 (20 hours)

# 6.

arXiv:2407.08025v1 Announce Type: new Abstract: The transition from classical physics to quantum mechanics has been mysterious. Here, we derive the space-independent von Neumann equation for electron spin mathematically from the classical Bloch or Majorana–Bloch equation, which is also derived. Subsequently, the space-independent Schr\”odinger–Pauli equation is derived in both the quantum mechanical and recently developed co-quantum dynamic frameworks.

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Syed Moeez Hassan, Viqar Husain, Babar Qureshi

Fri Jul 12 2024 12:24:16 (20 hours)

# 7.

arXiv:2407.08283v1 Announce Type: new Abstract: Global time is a gauge or relational choice of time variable in canonical gravity. Local time is the time used in a flat patch of spacetime. We compare the dynamics of a scalar field with respect to choices of global time and Minkowski patch time in an expanding cosmology. Our main results are that evolutions starting from the same initial conditions are similar on the time scales of terrestrial experiments, and that global time leads to a mechanism for evolving coupling constants.

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A. S. Sanz

Fri Jul 12 2024 12:24:15 (20 hours)

# 8.

arXiv:2407.08096v1 Announce Type: new Abstract: Quantum mechanics is able to produce challenging behaviors even in the simplest situations. This is possible because of the important dynamical role that phase plays in the evolution of quantum systems, very similar, nonetheless, to effects observable in analogous optical systems. The present work focuses on how Bohmian mechanics proves to be a rather convenient theoretical framework to analyze phase-based phenomena, since the phase constitutes the central element in this hydrodynamical formulation of quantum mechanics. More specifically, it allows us to understand how spatial phase variations give rise to velocity fields that eventually rule the dynamical behavior of quantum systems, and that, when integrated in time locally (i.e., taking into account specific positions), they provide us with a neat local (point by point) description of the system evolution in the configuration space. Indeed, it will also be seen that this idea transcends the quantum realm and can be profitably used to describe the behavior of optical analogs with rather singular behaviors. With this purpose, two interesting phenomena that take place in free space are considered, namely, the self-acceleration and shape-invariance of Airy beams, and spontaneous self-focusing.

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Mir Alimuddin, Snehasish Roy Chowdhury, Ram Krishna Patra, Subhendu B. Ghosh, Tommaso Tufarelli, Gerardo Adesso, Manik Banik

Fri Jul 12 2024 12:24:11 (20 hours)

# 9.

arXiv:2407.08292v1 Announce Type: new Abstract: Nonclassicality in composite quantum systems depicts several puzzling manifestations, with Einstein-Podolsky-Rosen entanglement, Schr\”odinger steering, and Bell nonlocality being the most celebrated ones. In addition to those, an unentangled quantum state can also exhibit nonclassicality, as evidenced from notions such as quantum discord and work deficit. Here, we propose a general framework to investigate nonclassical correlations in multipartite quantum states. The distinct signatures left on observable quantities, depending on whether the sub-parts of a composite system are probed separately or jointly, provide an operational avenue to construct different quantifiers that faithfully capture signatures of nonclassicality in quantum states. Along the line we unveil an intriguing phenomenon referred to as `nonlocal locking of observable quantities’, where the value of an observable quantity gets locked in the correlation of a nonclassical state. Our approach reduces the experimental demand for verification of nonclassicality in composite systems and can find applications for enhanced energy storage in quantum thermodynamical devices.

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Iulian D. Toader

Thu Jul 11 2024 12:13:53 (1 day)

# 10.

arXiv:2407.07102v1 Announce Type: new Abstract: The paper discusses Carnap’s claim that a proper philosophical analysis of quantum mechanics, including a determination of whether its logic has to be revised, requires a rational reconstruction of the theory. Several articulations of the notion of rational reconstruction are recalled, followed by a brief analysis of two standard criticisms of Carnap’s claim. The paper suggests that adopting inferentialism overcomes both criticisms, and then considers the possibility of formulating quantum mechanics as a Carnapian language with an inferentialist semantics.

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Thu Jul 11 2024 05:57:04 (2 days)

# 11.

Jalloh, Mahmoud (2024) Metaphysics and Convention in Dimensional Analysis, 1914-1917. [Preprint]

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Thu Jul 11 2024 05:56:16 (2 days)

# 12.

Jalloh, Mahmoud (2024) The Bridgman-Tolman-Warburton Correspondence on Dimensional Analysis, 1934. [Preprint]

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Francisco Caruso

Wed Jul 10 2024 12:24:27 (2 days)

# 13.

arXiv:2407.06218v1 Announce Type: new Abstract: In the History of Ideas, a succession of philosophical and scientific achievements, concerning the concept of space and its dimensionality, were essential to contribute, after a long period, to the theoretical possibility of thinking physical time with more than one dimension. Meanwhile, such a progress brought with it the expectation that one can either understand the role of dimensionality in the World or disclose how certain physical phenomena depend on it. Some of these issues are sketched throughout the text, as well as those remarkable moments in the History of Science where important contributions were made in order to give a satisfactory answer to the following inescapable question: — How many dimensions does time have?

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Philipp Berghofer, Jordan Fran\c{c}ois

Tue Jul 09 2024 12:03:42 (3 days)

# 14.

arXiv:2404.18582v3 Announce Type: replace Abstract: There is solid consensus among physicists and philosophers that, in gauge field theory, for a quantity to be physically meaningful or real, it must be gauge-invariant. Yet, every “elementary” field in the Standard Model of particle physics is actually gauge-variant. This has led a number of researchers to insist that new manifestly gauge-invariant approaches must be established. Indeed, in the foundational literature, dissatisfaction with standard methods for reducing gauge symmetries has been expressed: Spontaneous symmetry breaking is deemed conceptually dubious, while gauge fixing suffers the same limitations and is subject to the same criticisms as coordinate choices in General Relativity. An alternative gauge-invariant proposal was recently introduced in the literature, the so-called “dressing field method” (DFM). It is a mathematically subtle tool, and unfortunately prone to be confused with simple gauge transformations, hence with standard gauge~fixings. As a matter of fact, in the physics literature the two are often conflated, and in the philosophy community some doubts have been raised about whether there is any substantial difference between them. Clarifying this issue is of special significance for anyone interested in both the foundational issues of gauge theories and their invariant formulation. It is thus our objective to establish as precisely as possible the technical and conceptual distinctions between the DFM and gauge fixing.

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Tue Jul 09 2024 08:00:00 (4 days)

# 15.

Nature Physics, Published online: 09 July 2024; doi:10.1038/s41567-024-02567-0An improved optimization algorithm enables the training of large-scale neural quantum states in which the enormous number of neuron connections capture the intricate complexity of quantum many-body wavefunctions. This advance leads to unprecedented accuracy in paradigmatic quantum models, opening up new avenues for simulating and understanding complex quantum phenomena.

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Tue Jul 09 2024 02:59:14 (4 days)

# 16.

Placek, Tomasz and Wronski, Leszek (2024) On the growing universe of causal set theory – an order-type approach. Found Phys, 54 (42).

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Karen Mudryk

Mon Jul 08 2024 08:00:00 (5 days)

# 17.

Nature Physics, Published online: 08 July 2024; doi:10.1038/s41567-024-02583-0It has many names and yet no name. The designation of the universal gas constant as R has remained a mystery, as Karen Mudryk recounts.

arxiv > quant-ph > arXiv:2406.19419

Price-Wharton Constrained Colliders: Co-Causation or No Causation?

W.M. Stuckey, Michael Silberstein

]]>Price and Wharton have recently suggested that “constrained retrocausal collider bias is the origin of entanglement.” In this paper, we argue that their connection across a constrained collider (CCC) for the V-shaped case with the Bell states is not “a mechanism for entanglement,” providing a negative answer to the title of arXiv:2406.04571. Rather, CCC should be viewed as a novel approach to the causal modeling of entanglement, providing a perspectival co-causal relationship between the two wings of the experiment that does not violate locality or statistical independence. The key is to accept that quantum mechanics is complete, so the Bell states provide the “mechanism for entanglement” and CCC provides a causal model of entanglement per causal perspectivalism in accord with the different subjective spacetime models of the experiment. When combined into an objective spacetime model of the experiment, the subjective co-causation disappears leaving an objective acausal view of entanglement in accord with the quantum reconstruction program. Essentially, the quantum reconstruction program has rendered quantum mechanics a principle theory based on the observer-independence of Planck’s constant h as justified by the relativity principle (“no preferred reference frame” NPRF), exactly as special relativity is a principle theory based on the observer-independence of the speed of light c as justified by the relativity principle. Thus, NPRF + c is an adynamical global constraint on the configuration of worldtubes for the equipment in the experiment while NPRF + h is an adynamical global constraint on the distribution of quantum detection events in that context. Accordingly, CCC then provides a new way to understand causation subjectively per causal perspectivalism in this objectively acausal spacetime model of the experiment.

The Possibility Space Concept in Neuroscience: Possibilities, Constraints, and Explanation |

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Sun Jul 07 2024 12:08:42 (22 hours)

# 1.

Ross, Lauren N. and Jirsa, Viktor and McIntosh, Anthony (2024) The Possibility Space Concept in Neuroscience: Possibilities, Constraints, and Explanation. [Preprint]

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Sun Jul 07 2024 06:21:19 (1 day)

# 2.

Horvat, Sebastian and Toader, Iulian D. (2023) An Alleged Tension Between non-Classical Logics and Applied Classical Mathematics. [Preprint]

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Sun Jul 07 2024 06:21:04 (1 day)

# 3.

Horvat, Sebastian and Toader, Iulian D. (2023) Quantum logic and meaning. [Preprint]

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Sat Jul 06 2024 07:16:39 (2 days)

# 4.

Cheng, Bryan and Read, James (2024) The Hole Argument and Putnam’s Paradox. [Preprint]

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Sat Jul 06 2024 07:16:10 (2 days)

# 5.

ROVELLI, Carlo (2024) Princeton seminars on physics and philosophy. [Preprint]

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Jordan Scharnhorst, David Wolpert, Carlo Rovelli

Thu Jul 04 2024 12:25:39 (3 days)

# 6.

arXiv:2407.02840v1 Announce Type: cross Abstract: It is often stated that the second law of thermodynamics follows from the condition that at some given time in the past the entropy was lower than it is now. Formally, this condition is the statement that $E[S(t)|S(t_0)]$, the expected entropy of the universe at the current time $t$ conditioned on its value $S(t_0)$ at a time $t_0$ in the past, is an increasing function of $t $. We point out that in general this is incorrect. The epistemic axioms underlying probability theory say that we should condition expectations on all that we know, and on nothing that we do not know. Arguably, we know the value of the universe’s entropy at the present time $t$ at least as well as its value at a time in the past, $t_0$. However, as we show here, conditioning expected entropy on its value at two times rather than one radically changes its dynamics, resulting in a unexpected, very rich structure. For example, the expectation value conditioned on two times can have a maximum at an intermediate time between $t_0$ and $t$, i.e., in our past. Moreover, it can have a negative rather than positive time derivative at the present. In such “Boltzmann bridge” situations, the second law would not hold at the present time. We illustrate and investigate these phenomena for a random walk model and an idealized gas model, and briefly discuss the role of Boltzmann bridges in our universe.

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Eftychios Kaimakkamis, Karunava Sil

Thu Jul 04 2024 12:25:28 (3 days)

# 7.

arXiv:2407.03077v1 Announce Type: new Abstract: We study ambiguities in the precise formulation of the Wheeler-DeWitt equation for the wavefunction of the Universe that arise due to different operator orderings in the quantum Hamiltonian. We first examine the simpler case of the 1-dimensional minisuperspace model and derive the inner product measure that renders the Hamiltonian hermitian. Based on this, we establish that the Hilbert space inner products and quantum probabilities are universal, free of any ambiguities, at the semiclassical level. Recasting the Wheeler-DeWitt equation in a form invariant under field redefinitions of the minisuperspace variable, we show that all ambiguity functions are contained in a higher order scalar function, which can be used to define classes of models with universal predictions to all orders in $\hbar$. We then generalize to minisuperspace models of arbitrary dimension, upon the inclusion of an arbitrary number of scalar matter fields. We show that the hermiticity of the Hamiltonian in these cases provides a set of constraints, which can be used to cast the WDW equation in a covariant form and establish the universality of the inner products at the semiclassical level. In these cases as well, all ambiguity functions appear in a higher order scalar function of the minisuperspace manifold, which leads to distinct universality classes.

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Daine L. Danielson, Gautam Satishchandran, Robert M. Wald

Thu Jul 04 2024 12:25:26 (3 days)

# 8.

arXiv:2407.02567v1 Announce Type: cross Abstract: It was previously shown that if an experimenter, Alice, puts a massive or charged body in a quantum spatial superposition, then the presence of a black hole (or more generally any Killing horizon) will eventually decohere the superposition [arXiv:2205.06279, arXiv:2301.00026, arXiv:2311.11461]. This decoherence was identified as resulting from the radiation of soft photons/gravitons through the horizon, thus suggesting that the global structure of the spacetime is essential for describing the decoherence. In this paper, we show that the decoherence can alternatively be described in terms of the local two-point function of the quantum field within Alice’s lab, without any direct reference to the horizon. From this point of view, the decoherence of Alice’s superposition in the presence of a black hole arises from the extremely low frequency Hawking quanta present in Alice’s lab. We explicitly calculate the decoherence occurring in Schwarzschild spacetime in the Unruh vacuum from the local viewpoint. We then use this viewpoint to elucidate (i) the differences in decoherence effects that would occur in Schwarzschild spacetime in the Boulware and Hartle-Hawking vacua; (ii) the difference in decoherence effects that would occur in Minkowski spacetime filled with a thermal bath as compared with Schwarzschild spacetime; (iii) the lack of decoherence in the spacetime of a static star even though the vacuum state outside the star is similar in many respects to the Boulware vacuum around a black hole; and (iv) the requirements on the degrees of freedom of a material body needed to produce a decoherence effect that mimics that of a black hole.

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Casper van Elteren

Thu Jul 04 2024 10:06:23 (4 days)

# 9.

arXiv:2407.01762v1 Announce Type: new Abstract: From bird flocking to neural dynamics, complex systems generate fascinating structures and correlations. Often, seemingly simple dynamics lead to intricate emergent properties. Despite their visceral appeal, defining complex systems lacks universal agreement. In this paper, I will debunk three prevalent myths in complex systems and propose resolutions. This work contributes by offering a contemporary interpretation of complex systems, presenting essential definitions that benefit complexity scientists.

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Ovidiu Cristinel Stoica

Thu Jul 04 2024 10:06:21 (4 days)

# 10.

arXiv:2407.02421v1 Announce Type: cross Abstract: I show that, by the same criteria that led to Galilean and Special Relativity and gauge symmetries, there is no way to identify a unique set of observables that give the structure of space or spacetime. In some sense, space is lost in the state space itself. Moreover, the relationship between the observables and the physical properties they represent becomes relative. But we can verify that they are not relative, and the spacetime structure is unique. I show that this implies that not all structures isomorphic with observers can be observers, contradicting Structural Realism and Physicalism. This indicates a strong connection between spacetime and the sentience of the observers, as anticipated by some early contributors to Special and General Relativity.

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A. Rod Gover, Jarosław Kopiński, and Andrew Waldron

Wed Jul 03 2024 18:00:00 (4 days)

# 11.

Author(s): A. Rod Gover, Jarosław Kopiński, and Andrew Waldron

We develop the mathematics needed to treat the interaction of geometry and stress at any isotropic spacetime singularity. This enables us to handle the Einstein equations at the initial singularity and characterize allowed general relativistic stress-energy tensors. Their leading behaviors are dicta…

[Phys. Rev. Lett. 133, 011401] Published Wed Jul 03, 2024

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Tue Jul 02 2024 18:07:14 (5 days)

# 12.

Ryoo, Hong Joo (2024) On Functionalism’s Context-Dependent Explanations of Mental States. [Preprint]

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Tue Jul 02 2024 18:06:56 (5 days)

# 13.

Wray, K. Brad (2024) Influences on Kuhn and the Relationship between History and Philosophy of Science. In: UNSPECIFIED.

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Tue Jul 02 2024 18:00:42 (5 days)

# 14.

Mulder, Ruward A. (2024) The Classical Stance: Dennett’s Criterion in Wallacian quantum mechanics. Studies in History and Philosophy of Science. ISSN 00393681

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Tue Jul 02 2024 18:00:09 (5 days)

# 15.

Patton, Lydia (2024) Kuhn-Loss, Persuasion, and Incommensurability Again – Can Paradigm-Change be Rationally Justified? In: UNSPECIFIED.

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Tue Jul 02 2024 17:59:37 (5 days)

# 16.

March, Eleanor and Wolf, William J. and Read, James (2024) On the geometric trinity of gravity, non-relativistic limits, and Maxwell gravitation. [Preprint]

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Charles T. Sebens

Tue Jul 02 2024 12:06:02 (5 days)

# 17.

arXiv:2407.00210v1 Announce Type: new Abstract: The view that the laws of nature produce later states of the universe from earlier ones (prominently defended by Maudlin) faces difficult questions as to how the laws produce the future and whether that production is compatible with special relativity. This article grapples with those questions, arguing that the concerns can be overcome through a close analysis of the laws of classical mechanics and electromagnetism. The view that laws produce the future seems to require that the laws of nature take a certain form, fitting what Adlam has called “the time evolution paradigm.” Making that paradigm precise, we might demand that there be temporally local dynamical laws that take properties of the present and the arbitrarily-short past as input, returning as output changes in such properties into the arbitrarily-short future. In classical mechanics, Newton’s second law can be fit into this form if we follow a proposal from Easwaran and understand the acceleration that appears in the law to capture how velocity (taken to be a property of the present and the arbitrarily-short past) changes into the arbitrarily-short future. The dynamical laws of electromagnetism can be fit into this form as well, though because electromagnetism is a special relativistic theory we might require that the laws meet a higher standard: linking past light-cone to future light-cone. With some work, the laws governing the evolution of the vector and scalar potentials, as well as the evolution of charged matter, can be put in a form that meets this higher standard.

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Michael J. W. Hall

Mon Jul 01 2024 12:10:13 (6 days)

# 18.

arXiv:2406.19426v1 Announce Type: 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 incompleteness argument to support his claim. It is shown this argument is itself incomplete, via counterexamples that expose two logical gaps. However, closing these gaps via a strong “counterfactual” reality criterion enables a rigorous derivation of each of quantum incompleteness, determinism and parameter independence, and in this sense justifies Bell’s claim. Consequences for quantum interpretations are briefly discussed.

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Debarchan Das

Mon Jul 01 2024 08:00:00 (1 week)

# 19.

Nature Physics, Published online: 01 July 2024; doi:10.1038/s41567-024-02581-2A Journey from Earth to Venus to Mars

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Sun Jun 30 2024 06:13:45 (1 week)

# 20.

Arroyo, Raoni Wohnrath and NUNES FILHO, LAURO DE MATOS and MOREIRA DOS SANTOS, FREDERIK (2024) Towards a process-based approach to consciousness and collapse in quantum mechanics. Manuscrito, 47 (1). ISSN 0100-6045

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Sat Jun 29 2024 12:52:26 (1 week)

# 21.

Allori, Valia (2024) Quantum Ontology and Intuitions. [Preprint]

]]># 22.

Schrodinger’s Cat: Qbit or Cbit?

Stuckey, W. M. (2024) Schrodinger’s Cat: Qbit or Cbit? [Preprint]

Abstract: In 1935, Schrodinger introduced what he considered to be a reductio against the Copenhagen interpretation of quantum mechanics. His argument was based on a “ridiculous case” that is widely used today to portray the counterintuitive nature of quantum superposition. Schrodinger imagined that a cat was placed out of sight in a box with a mechanism that would kill the cat within an hour with 50% probability. Since the deadly mechanism employed a quantum process for its trigger, he supposed the cat was in a quantum superposition of 50% Live Cat + 50% Dead Cat. In this paper, we point out that if Schrodinger’s Cat actually represents a quantum superposition of 50% Live Cat + 50% Dead Cat, as is commonly asserted, then the cat-box system is the physical instantiation of a quantum bit of information (Qbit). This agrees with the Copenhagen interpretation, which says there is no fact of the matter as to whether the cat is dead or alive until a measurement is made. Accordingly, the state 50% Live Cat + 50% Dead Cat must be the outcome with 100% probability for some measurement complementary to the measurement ‘open the box’ with its two possible measurement outcomes of Live Cat or Dead Cat. If one cannot provide a physically meaningful complementary measurement to ‘open the box’ with a clear empirical consequence represented by the state 50% Live Cat + 50% Dead Cat as its (certain) measurement outcome, then the state 50% Live Cat + 50% Dead Cat only represents a distribution of outcomes for many trials of that single ‘open the box’ measurement. That is, the state 50% Live Cat + 50% Dead Cat is not a quantum superposition and Schrodinger’s Cat is merely the physical instantiation of a classical bit of information (Cbit) in support of Schrodinger’s reductio. The double-slit experiment is provided as an example of a Qbit to illustrate what is meant by complementary measurements (position x and momentum p for the double-slit experiment).

In this paper we examine the quantum wave equations for an observer experiencing constant gravity acceleration. For non-relativistic Newtonian gravity by using a thought experiment (along with related derivation method) and the weak equivalence principle, we derive the Schrodinger wave equation for a “local observer” (located in a small spatial interval), stationary with respect to a static gravitational field. In the case of curved space time with a static space time metric, by using the same procedure and applying the equivalence principle, we derive the Dirac and the Klein-Gordon wave equations for a local observer, stationary with respect to the static space time metric background.

]]>The central mystery of quantum mechanics is the principle of quantization. The Heisenberg uncertainty principle is a consequence of quantization, as are the interpretative problems of quantum mechanics, such as the measurement problem and wave-particle duality. John Wheeler expressed the mystery of quantization in the question: “How come the quantum? What is the deeper principle that lies behind the strange quantum behavior that rules our world?” The present article proposes a deeper principle that offers an answer to Wheeler’s question. At its core are two closely related elements. One is Sciama’s 1958 suggestion that one half of the causal determinants of systems always lie in their future—quantization simply reflecting our ignorance of that future half. The other is the postulation of an underlying periodic process that every spin-half particle undergoes in the ‘shadow’ of the Heisenberg uncertainty principle. It is an extension of an early idea of Dirac’s. The deeper principle also suggests an answer to a related mystery: to *what* exactly might the frequency and the wavelength actually refer in the Einstein-de Broglie relations (besides, trivially, to the frequency and wavelength of a quantum system represented by the wave function)? In other words, what are they the frequency and wavelength *of?* And how does the frequency (whatever it’s the frequency of) entail, *physically*, an energy, i.e. require Planck’s constant as a conversion factor when energy is expressed in conventional units?

We introduce a new ansatz that,**“ the Universe size and age, are the maximal spatial and temporal uncertainties, respectively- within the purview of uncertainty principles of Quantum Mechanics”**. This allows us to derive a relationship between Planck’s constant and the Hubble’s constant. The ansatz thus connects microcosm and macrocosm seemlessly. Accordingly, we obtain numerical value of the minimum momentum and energy uncertainties, which are locally experimentally verifiable. Reciprocally, if one has experimentally verified values of minimum Energy and Momentum, then the Universe’s Age and Size can be deduced.This allows a novel approach to unifying Quantum Mechanics and Cosmology/General Relativity.

Revising the quantum work fluctuation framework to encompass energy conservation |

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Giulia Rubino, Karen V. Hovhannisyan, Paul Skrzypczyk

Fri Jun 28 2024 12:31:02 (21 hours)

# 1.

arXiv:2406.18632v1 Announce Type: new Abstract: Work is a process-based quantity, and its measurement typically requires interaction with a measuring device multiple times. While classical systems allow for non-invasive and accurate measurements, quantum systems present unique challenges due to the influence of the measuring device on the final value of work. As recent studies have shown, among these challenges is the impossibility of formulating a universal definition of work that respects energy conservation for coherent quantum systems and is compatible with the Jarzynski equality – a fluctuation relation linking the equilibrium free energy difference to the non-equilibrium work. Here we overcome this challenge by introducing a genuinely quantum, positive correction to the Jarzynski equality stemming from imposing energy conservation. When sufficiently large, this correction forces quantum work to violate the second law more often. Moreover, we construct modified two-point measurement (TPM) schemes for work that ensure energy conservation for coherent quantum states and align with our quantum-corrected fluctuation relation. We further underscore the practicality and effectiveness of these schemes by providing detailed circuit implementations for them.

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Raymond Isichei, Joao Magueijo

Fri Jun 28 2024 12:30:59 (21 hours)

# 2.

arXiv:2406.18979v1 Announce Type: new Abstract: We explore the well know mass deficit/surplus phenomenon in General Relativity to suggest that it could play a part in the dark matter conundrum. Specifically in collapses and condensations of matter associated with negative intrinsic curvature of the foliation associated with the asymptotic boundary conditions, the external (ADM) mass can vastly exceed the integrated local energy over the internal volume. This can be phrased in terms of a deficit of volume for a given surface area (with respect to zero curvature). We explore the phenomenon in the context of generalizations of the Oppenheimer-Snyder models and other “cut and paste” models, the Lemaitre-Bondi-Tolman metric and several others. We produce constructions where the internal object is contracting or expanding, has a life time different from the asymptotic Universe, as well as a volume different than the escavated volume from the Universe. These are purely relativistic constructions and they could play a role in the puzzle of dark matter: attraction without visible or indeed any matter.

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Jerzy Paczos, Joshua Foo, Magdalena Zych

Fri Jun 28 2024 12:30:48 (21 hours)

# 3.

arXiv:2406.19037v1 Announce Type: cross Abstract: State-of-the-art atom interferometers can keep atoms in a superposition of heights in Earth’s gravitational field for times reaching minute-scale, allowing for precise measurements of the gravitational potential. Yet, the phase shifts measured in such experiments can always be explained with a non-relativistic theory of gravity. There is therefore growing interest in finding feasible ways to use such new experimental capabilities to go beyond the non-relativistic regime. Here we propose modifying the existing experimental setups to probe both the quantum and the general relativistic effects on the atom’s dynamics. Our proposal consists of adding two additional laser pulses in a trapped atom interferometer that would set up a quantum clock trapped at a superposition of heights reading a quantum superposition of relativistic proper times. We derive the phases acquired by different trajectories in the interferometer and demonstrate that the effect of superposition of proper times would manifest itself in two ways in the interference pattern: as visibility modulations, and as a shift of the resonant frequency of the atom. We argue that the latter might be observable with current technology.

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Fri Jun 28 2024 01:53:37 (1 day)

# 4.

Bhatta, Varun (2024) The Controversy about Interference of Photons. [Preprint]

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Fri Jun 28 2024 01:46:28 (1 day)

# 5.

Slavov, Matias (2024) About time, concisely. Metascience. ISSN 0815-0796

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Fri Jun 28 2024 01:43:32 (1 day)

# 6.

Kastner, Ruth (2024) Conventional Quantum Theory Does Not Support A Coherent Relational Account. [Preprint]

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Thu Jun 27 2024 07:05:18 (2 days)

# 7.

Arroyo, Raoni Wohnrath and Arenhart, Jonas R. B. (2024) Quantum ontology de-naturalized: What we can’t learn from quantum mechanics. THEORIA. An International Journal for Theory, History and Foundations of Science. ISSN 2171-679X

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Thu Jun 27 2024 05:34:06 (2 days)

# 8.

Cuffaro, Michael E. and Hartmann, Stephan (2023) The Open Systems View. [Preprint]

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Thu Jun 27 2024 05:33:36 (2 days)

# 9.

Vanzella, Daniel A. Turolla and Butterfield, Jeremy (2024) A frame-bundle formulation of quantum reference frames: from superposition of perspectives to superposition of geometries. [Preprint]

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Helen Meskhidze

Wed Jun 26 2024 12:10:05 (2 days)

# 10.

arXiv:2406.17594v1 Announce Type: new Abstract: I consider the classical (i.e., non-relativistic) limit of Teleparallel Gravity, a relativistic theory of gravity that is empirically equivalent to General Relativity and features torsional forces. I show that as the speed of light is allowed to become infinite, Teleparallel Gravity reduces to Newtonian Gravity without torsion. I compare these results to the torsion-free context and discuss their implications on the purported underdetermination between Teleparallel Gravity and General Relativity. I conclude by considering alternative approaches to the classical limit developed in the literature.

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Michael J. W. Hall

Wed Jun 26 2024 12:10:02 (2 days)

# 11.

arXiv:2009.14223v2 Announce Type: replace-cross Abstract: A 1964 paper by John Bell gave the first demonstration that quantum mechanics is incompatible with local hidden variables. There is an ongoing and vigorous debate on whether he relied on an assumption of determinism, or instead, as he later claimed, 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 shown that the weak form of locality used in Bell’s 1964 paper (parameter independence) is insufficient for such a derivation, whereas an independent form called outcome independence is sufficient even when weak locality does not hold. It further follows that outcome independence, by itself, implies that standard quantum mechanics is incomplete. It is also shown that an appeal by Bell to the Einstein-Rosen-Podolsky argument to support his claim fails, via examples that expose logical gaps in this argument. However, replacing the reality criterion underpinning the argument by a stronger criterion enables a rigorous derivation of both weak locality and determinism, as required for Bell’s 1964 paper. Consequences for quantum interpretations, locality, and classical common causes are briefly discussed, with reference to an example of local classical indeterminism.

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Johannes Branahl

Tue Jun 25 2024 12:20:49 (3 days)

# 12.

arXiv:2406.15837v1 Announce Type: new Abstract: In recent years, criticism of the methodology of particle physics beyond the Standard Model has increased, diagnosing too much reliance on aesthetic criteria for theory development and evaluation. Faced with several decades of experimental confirmation of all theories lacking, we subject four aesthetic criteria – simplicity, symmetry, elegance, and inevitability -, regularly mentioned in theory evaluation, to critical examination. We find that these criteria, all of which can be reduced to a desire for simplicity, have repeatedly misled modern particle physics. This is largely due to the lack of metatheoretical permanence of a uniform conception of simplicity. The reductionist claim of particle physics – the search for simple fundamental principles in a complex world – will be worked out as the reason why this discipline is particularly susceptible to the aesthetic appeal of simplicity. Thus, compared to disciplines dealing with complex phenomena, aesthetic criteria are much more frequently applied, exposing particle physics to the risk of missteps and dead ends.

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James Owen Weatherall, Helen Meskhidze

Tue Jun 25 2024 12:20:48 (3 days)

# 13.

arXiv:2406.15932v1 Announce Type: new Abstract: Teleparallel gravity shares many qualitative features with general relativity, but differs from it in the following way: whereas in general relativity, gravitation is a manifestation of space-time curvature, in teleparallel gravity, spacetime is (always) flat. Gravitational effects in this theory arise due to spacetime torsion. It is often claimed that teleparallel gravity is an equivalent reformulation of general relativity. In this paper we question that view. We argue that the theories are not equivalent, by the criterion of categorical equivalence and any stronger criterion, and that teleparallel gravity posits strictly more structure than general relativity.

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Mariana Espinosa-Aldama, Sergio Mendoza

Tue Jun 25 2024 12:20:47 (3 days)

# 14.

arXiv:2406.15517v1 Announce Type: cross Abstract: We propose several hierarchical graphs that represent the semantic relations between physical theories, their fundamental constants and units of measurement. We begin with an alternative representation of Zelmanov’s cube of fundamental constants as a concept lattice. We then propose the inclusion of a new fundamental constant: Milgrom’s critical acceleration and discuss the implications of such analysis. We then look for the same fundamental constants in a graph that relates magnitudes and units of measurement in the International System of Units. This exercise shows the potential of visualizing hierarchical networks as a tool to better comprehend the interrelations and dependencies of physical magnitudes, units and theories. New regimes of application may be deduced, as well as an interesting reflection on our ontologies and corresponding theoretical objects.

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Wolfgang Bietenholz, Jos\’e Antonio Garc\’ia-Hern\’andez

Tue Jun 25 2024 12:20:46 (3 days)

# 15.

arXiv:2406.15706v1 Announce Type: cross Abstract: Peter Higgs was a British theoretical physicist, famous for his work published in 1964, where he proposed a mechanism that can generate masses for elementary particles, while respecting gauge invariance. Half a century later, two experiments at CERN confirmed that this mechanism is realized in nature. On April 8th, we received the sad news of the passing of the great pioneer of elementary particle physics. This article is dedicated to his memory, and to the mechanism and particle that bear his name. — Peter Higgs fue un f\’isico te\’orico brit\’anico, famoso por su trabajo de 1964 donde propuso un mecanismo que puede generar masas para part\’iculas elementales, conforme a la simetr\’ia de norma. Medio siglo m\’as tarde, dos experimentos del CERN confirmaron que este mecanismo est\’a realizado en la naturaleza. El 8 de abril nos lleg\’o la triste noticia del fallecimiento del gran pionero de la fisica de part\’iculas elementales. Este art\’iculo es dedicado a su memoria, as\’i como al mecanismo y a la part\’icula que llevan su nombre.

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Tue Jun 25 2024 03:24:07 (4 days)

# 16.

de Ronde, Christian and Fernández Mouján, Raimundo and Massri, Cesar (2024) On the Relative Nature of Quantum Individuals. [Preprint]

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Tue Jun 25 2024 03:20:35 (4 days)

# 17.

]]>Jiang, Yihan (2024) The Metaphysics of Mechanisms: An Ontic Structural Realist Perspective. [Preprint]

Classical Concepts and the Bohrian Epistemological Thesis |

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Sat Jun 22 2024 02:34:28 (1 day)

# 1.

Singh, Mihir (2023) Classical Concepts and the Bohrian Epistemological Thesis. [Preprint]

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Koki Tokeshi and Vincent Vennin

Fri Jun 21 2024 18:00:00 (1 day)

# 2.

Author(s): Koki Tokeshi and Vincent Vennin

Theorists explain why cosmic inflation might appear to be driven by a single inflaton field, even if it had actually been driven by two or more such fields.

[Phys. Rev. Lett. 132, 251001] Published Fri Jun 21, 2024

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Fri Jun 21 2024 17:18:02 (1 day)

# 3.

Esser, Stephen (2024) Relational Quantum Mechanics, Causal Composition, and Molecular Structure. [Preprint]

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Fri Jun 21 2024 17:06:16 (1 day)

# 4.

Maxwell, Nicholas (2024) Hawking Radiation A Special Case of Probabilistic Transitions of Propensiton Quantum Theory. [Preprint]

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Fri Jun 21 2024 17:01:41 (1 day)

# 5.

Wallace, David (2024) Quantum Systems Other Than the Universe. [Preprint]

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Wed Jun 19 2024 02:17:31 (4 days)

# 6.

Gajic, Gregor and Lilani, Nikesh and Read, James (2024) Another philosophical look at twistor theory. [Preprint]

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John Realpe-G\’omez

Tue Jun 18 2024 12:09:17 (4 days)

# 7.

arXiv:2112.15428v2 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.

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Ivan Arraut

Tue Jun 18 2024 12:09:09 (4 days)

# 8.

arXiv:2406.10644v1 Announce Type: new Abstract: The information paradox suggests that the black hole loses information when it emits radiation. In this way, the spectrum of radiation corresponds to a mixed (non-pure) quantum state even if the internal state generating the black-hole is expected to be pure in essence. In this paper we propose an argument solving this paradox by understanding the process of spontaneous symmetry breaking when the black-hole selects one among the many possible ground states, emitting then radiation as a consequence of it. Here the particle operator number is the order parameter. This mechanism explains the connection between the density matrix corresponding to the pure state describing the black-hole state and the density matrix describing the spectrum of radiation (mixed quantum state). From this perspective, we can recover the black-hole information from the superposition principle applied to the different possible order parameters (particle number operators).

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Martin Plávala, Teiko Heinosaari, Stefan Nimmrichter, and Otfried Gühne

Mon Jun 17 2024 18:00:00 (5 days)

# 9.

Author(s): Martin Plávala, Teiko Heinosaari, Stefan Nimmrichter, and Otfried Gühne

Quantumness refers to the peculiar and counterintuitive characteristics exhibited by quantum systems. Tsirelson inequalities have emerged as a powerful tool in quantum theory to detect quantumness and entanglement of harmonic oscillators, spins undergoing uniform precession, and anharmonic systems. …

[Phys. Rev. A 109, 062216] Published Mon Jun 17, 2024

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Christian de Ronde, Raimundo Fern\’andez Mouj\’an, C\’esar Massri

Mon Jun 17 2024 12:21:12 (5 days)

# 10.

]]>arXiv:2406.09452v1 Announce Type: cross Abstract: In this work we argue against the interpretation that underlies the “Standard” account of Quantum Mechanics (SQM) that was established during the 1930s by Niels Bohr and Paul Dirac. Ever since, following this orthodox narrative, physicists have dogmatically proclaimed — quite regardless of the deep contradictions and problems — that the the theory of quanta describes a microscopic realm composed of elementary particles (such as electrons, protons and neutrons) which underly our macroscopic world composed of tables, chairs and dogs. After critically addressing this atomist dogma still present today in contemporary (quantum) physics and philosophy, we present a new understanding of quantum individuals defined as the minimum set of relations within a specific degree of complexity capable to account for all relations within that same degree. In this case, quantum individuality is not conceived in absolute terms but — instead — as an objectively relative concept which even though depends of the choice of bases and factorizations remain nonetheless part of the same invariant representation.

The breakdown of effective field theory in particle physics: Lessons for understanding intertheoretic relations |

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Sat Jun 15 2024 04:48:26 (5 hours)

# 1.

Koberinski, Adam (2024) The breakdown of effective field theory in particle physics: Lessons for understanding intertheoretic relations. [Preprint]

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\’Alvaro Mozota Frauca

Fri Jun 14 2024 12:01:08 (22 hours)

# 2.

arXiv:2406.08501v1 Announce Type: cross Abstract: In this paper I offer an introduction to group field theory (GFT) and to some of the issues affecting the foundations of this approach to quantum gravity. I first introduce covariant GFT as the theory that one obtains by interpreting the amplitudes of certain spin foam models as Feynman amplitudes in a perturbative expansion. However, I argue that it is unclear that this definition of GFTs amounts to something beyond a computational rule for finding these transition amplitudes and that GFT doesn’t seem able to offer any new insight into the foundations of quantum gravity. Then, I move to another formulation of GFT which I call canonical GFT and which uses the standard structures of quantum mechanics. This formulation is of extended use in cosmological applications of GFT, but I argue that it is only heuristically connected with the covariant version and spin foam models. Moreover, I argue that this approach is affected by a version of the problem of time which raises worries about its viability. Therefore, I conclude that there are serious concerns about the justification and interpretation of GFT in either version of it.

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Johan F. Hoorn, Johnny K. W. Ho

Fri Jun 14 2024 12:01:08 (22 hours)

# 3.

arXiv:2406.08533v1 Announce Type: new Abstract: The observer effect in quantum physics states that observation inevitably influences the system being observed. Our proposed epistemic framework treats the observer as an integral part of sensory information processing within entangled quantum systems, highlighting the subjective and probabilistic aspects of observation and inference. Our study introduces a hierarchical model for fuzzy instance classification, which aligns sensory input with an observer’s pre-existing beliefs and associated quantum probability-based truth values. Sensory data evolves via interaction with observer states, as described by the Lindblad master equation, and is then classified adaptively using positive operator-valued measures (POVM). Our parametrization employs measures of concurrent similarity and dissimilarity, facilitating perceptual associations and asymmetric cognition. The observer’s position on a skeptic-believer spectrum modulates ambiguous matching of noisy perceptions. We show that sensory information becomes intricately entangled with observer states, yielding a wide array of probabilistic classification results. This framework lays the groundwork for a quantum-probability-based understanding of the observer effect, encouraging further exploration of quantum correlations and properties in cognitive processes.

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Nosratollah Jafari

Fri Jun 14 2024 12:01:08 (22 hours)

# 4.

arXiv:2406.08514v1 Announce Type: new Abstract: We study the \k{appa}-Poincare and the Magueijo-Smolin (MS) DSR in the context of the relative locality theory. This theory assigns connection, torsion and curvature to momentum space of every modified theory beyond special relativity. We obtain these quantities for the \k{appa}-Poincare and the MS DSR in all order of the Planck length, at the every point of the momentum space. The connection for the \k{appa}-Poincare theory and the MS DSR can be non-zero. The torsion for the \k{appa}-Poincare theory can also be non-zero, but it is zero for the MS DSR. The curvature for the \k{appa}-Poincare theory and the MS DSR are zero. We will find that the non-zero torsion and curvature of the momentum space implies a non-commutative spactime which is tangent to this momentum space. Also, we show that the torsion for every Abelian DSR theory is zero at the origin of the momentum space. At the end, we will discus dual spacetime transformations for the \k{appa}-Poincare theory and MS-DSR.

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Toby Pereira

Fri Jun 14 2024 12:01:07 (22 hours)

# 5.

arXiv:2010.05695v2 Announce Type: replace Abstract: This paper uses anthropic reasoning to argue for the Non-Arbitrary Existence Hypothesis (NAEH). Nick Bostrom’s Self-Sampling Assumption (SSA) combined with NAEH is compared against SSA without such an assumption and also SSA with the Self-Indication Assumption (SIA). When considered in the light of various thought experiments, including the Incubator Gedanken, the Doomsday Argument, the Presumptuous Philosopher and Bostrom’s Adam and Eve thought experiments, SSA with NAEH is found to give the most plausible results. The possibility of principles not explicitly considered in the paper being superior also is discussed but found to have limited plausibility.

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Mark Buchanan

Fri Jun 14 2024 08:00:00 (1 day)

# 6.

Nature Physics, Published online: 14 June 2024; doi:10.1038/s41567-024-02533-wHuman intelligence is not computable

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Ulrich Mohrhoff

Wed Jun 12 2024 16:28:46 (2 days)

# 7.

arXiv:2406.06659v1 Announce Type: cross Abstract: Owing to the contextuality of the properties of quantum objects, quantum mechanics does not appear to countenance the elision of the thinking and perceiving subject. If quantum objects owe their properties to the experimental conditions in which they are observed, the experimental apparatus cannot owe its properties to the quantum objects of which it is commonly said to be composed. It follows that neither quantum objects nor measuring instruments can be regarded as property-carriers existing independently of conscious subjects. However, if the difference between the classical domain and the quantum domain is understood as essentially the difference between the manifested world and what is instrumental in its manifestation, the elision of the subject can again be achieved.

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Wed Jun 12 2024 04:43:04 (3 days)

# 8.

Barrett, Thomas William and Manchak, JB (2024) On Coordinates and Spacetime Structure. [Preprint]

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

Tue Jun 11 2024 12:06:18 (3 days)

# 9.

arXiv:2406.05169v1 Announce Type: new Abstract: The purpose of this article is to provide an informal introduction to quantum physics, like if we were following the path of a police investigation. The scenery involves 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 tentatively explain physical facts, moving cautiously from a classical to a quantum description. Statements such as ‘a quantum superposition is like being in two states at the same time’, ‘quantum entanglement is like an instantaneous action at a distance’, or ‘facts are relative’, will be prohibited as empty of explanatory content. As a spoiler, and maybe against current common wisdom, but not giving up physical realism, the conclusion of the enquiry will be 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.

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D V Redzic

Tue Jun 11 2024 12:06:17 (3 days)

# 10.

arXiv:2406.06159v1 Announce Type: new Abstract: A derivation of Balmer’s formula is presented, guided by the principles of simplicity and harmony.

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R. E. Kastner

Tue Jun 11 2024 12:06:15 (3 days)

# 11.

arXiv:2311.11456v2 Announce Type: replace Abstract: This essay offers a meta-level analysis in the sociology and history of physics in the context of the so-called “Arrow of Time Problem” or “Two Times Problem,” which asserts that the empirically observed directionality of time is in conflict with physical theory. I argue that there is actually no necessary conflict between physics and the arrow of time, and that the observed directionality of time is perfectly consistent with physics unconstrained by certain optional metaphysical, epistemological and methodological beliefs and practices characterizing the conventional or Received View.

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Christine C. Dantas (Astrophysics Division – INPE – Brazil)

Tue Jun 11 2024 12:06:13 (3 days)

# 12.

arXiv:1801.01719v3 Announce Type: replace-cross Abstract: “Norton’s Dome” is an example of a Newtonian system that violates the Lipschitz condition at a single point, leading to non-unique solutions (indeterminism). Here we reformulate this problem into a “weak” form (in the sense of distributions). In our description the indeterminism manifests through the problematic interpretation of initial conditions, since distributions (as linear functionals on the space of test functions) do not have values at individual points.

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Daniele Oriti

Mon Jun 10 2024 12:25:56 (4 days)

# 13.

arXiv:2212.12782v3 Announce Type: replace Abstract: We scan Paul K. Feyerabend’s work in philosophy of physics and of science more generally for insights that could be useful for the contemporary debate on the foundations of quantum mechanics. We take as our starting point what Feyerabend has actually written about quantum mechanics, but we extend our analysis to his general views on realism, objectivity, pluralism, and the relation between physics and philosophy, finding that these more general views could in fact offer many interesting insights for physicists and philosophers working on quantum foundations.

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Huw Price, Ken Wharton

Mon Jun 10 2024 12:25:45 (4 days)

# 14.

]]>arXiv:2406.04571v1 Announce Type: cross Abstract: We propose that quantum entanglement is a special sort of selection artefact, explicable as a combination of (i) collider bias and (ii) a boundary constraint on the collider variable. We show that the proposal is valid for a special class of (`W-shaped’) Bell experiments involving delayed-choice entanglement swapping, and argue that it can be extended to the ordinary (`V-shaped’) case. The proposal requires no direct causal influence outside lightcones, and may hence offer a way to reconcile Bell nonlocality and relativity. The main argument is a detailed version of an approach previously outlined in arXiv:2404.13928 [quant-ph].

Absolute representations and modern physics |

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Thu Jun 06 2024 03:00:40 (2 days)

# 1.

Jacobs, Caspar and Read, James (2024) Absolute representations and modern physics. [Preprint]

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Anthony Duncan

Wed Jun 05 2024 12:36:20 (2 days)

# 2.

arXiv:2406.02149v1 Announce Type: new Abstract: English translation of John von Neumann’s 1927 trilogy on the foundations of quantum mechanics with an introduction and detailed commentary.

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Tue Jun 04 2024 02:43:11 (4 days)

# 3.

Vaidman, Lev (2024) Conservation laws in the many-worlds interpretation of quantum mechanics. [Preprint]

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Tue Jun 04 2024 02:39:23 (4 days)

# 4.

List, Christian (2024) A quadrilemma for theories of consciousness. The Philosophical Quarterly.

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Pablo L. Saldanha

Mon Jun 03 2024 18:00:00 (4 days)

# 5.

Author(s): Pablo L. Saldanha

The gauge invariance of the Aharonov-Bohm (AB) effect with a quantum treatment for the electromagnetic field is demonstrated. We provide an exact solution for the electromagnetic ground energy due to the interaction of the quantum electromagnetic field with the classical charges and currents that ac…

[Phys. Rev. A 109, 062205] Published Mon Jun 03, 2024

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Roope Uola, Erkka Haapasalo, Juha-Pekka Pellonpää, and Tom Kuusela

Mon Jun 03 2024 18:00:00 (4 days)

# 6.

Author(s): Roope Uola, Erkka Haapasalo, Juha-Pekka Pellonpää, and Tom Kuusela

We propose a generalization of the Leggett-Garg conditions for macrorealistic behavior. Our proposal relies on relaxing the postulate of noninvasive measurability with that of

retrievability of information. This leads to a strictly broader class of hidden-variable theories than those having a macror…[Phys. Rev. A 109, 062202] Published Mon Jun 03, 2024

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Mon Jun 03 2024 03:40:20 (5 days)

# 7.

Morgan, Peter (2022) The collapse of a quantum state as a joint probability construction. J. Phys. A: Math. Theor. 55 254006 (2022), 55.

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Mon Jun 03 2024 03:34:30 (5 days)

# 8.

Ketland, Jeffrey (2023) Length Abstraction in Euclidean Geometry. [Preprint]

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Sat Jun 01 2024 15:06:13 (6 days)

# 9.

Murgueitio Ramírez, Sebastián (2024) Symmetries and Measurements. [Preprint]

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Sat Jun 01 2024 15:05:45 (6 days)

# 10.

]]>Wenmackers, Sylvia (2024) Remote possibilities in branching time structures. [Preprint]

A Triumvirate of AI Driven Theoretical Discovery |

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Yang-Hui He

Fri May 31 2024 19:28:02 (16 hours)

# 1.

arXiv:2405.19973v1 Announce Type: cross Abstract: Recent years have seen the dramatic rise of the usage of AI algorithms in pure mathematics and fundamental sciences such as theoretical physics. This is perhaps counter-intuitive since mathematical sciences require the rigorous definitions, derivations, and proofs, in contrast to the experimental sciences which rely on the modelling of data with error-bars. In this Perspective, we categorize the approaches to mathematical discovery as “top-down”, “bottom-up” and “meta-mathematics”, as inspired by historical examples. We review some of the progress over the last few years, comparing and contrasting both the advances and the short-comings in each approach. We argue that while the theorist is in no way in danger of being replaced by AI in the near future, the hybrid of human expertise and AI algorithms will become an integral part of theoretical discovery.

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Lawrence M. Krauss, Francesco Marino, Samuel L. Braunstein, Mir Faizal, Naveed A. Shah

Fri May 31 2024 19:28:02 (16 hours)

# 2.

arXiv:2405.19385v1 Announce Type: new Abstract: Recent experimental progresses in controlling classical and quantum fluids have made it possible to realize acoustic analogues of gravitational black holes, where a flowing fluid provides an effective spacetime on which sound waves propagate, demonstrating Hawking-like radiation and Penrose superradiance. We propose the exciting possibility that new hydrodynamic systems might provide insights to help resolve mysteries associated with quantum gravity, including the black hole information-loss paradox and the removal of spacetime singularities.

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Leonardo Castellani, Anna Gabetti

Fri May 31 2024 19:28:00 (16 hours)

# 3.

arXiv:2405.19427v1 Announce Type: new Abstract: The formalism of generalized quantum histories allows a symmetrical treatment of space and time correlations, by taking different traces of the same history density matrix. We recall how to characterize spatial and temporal entanglement in this framework. An operative protocol is presented, to map a history state into the ket of a static composite system. We show, by examples, how the Leggett-Garg and the temporal CHSH inequalities can be violated in our approach.

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Kallan Berglund, Martin Bojowald, Aurora Colter, Manuel Diaz

Fri May 31 2024 19:27:57 (16 hours)

# 4.

arXiv:2405.20193v1 Announce Type: new Abstract: Superpositions of black holes can be described geometrically using a combined canonical formulation for space-time and quantum states. A previously introduced black-hole model that includes quantum fluctuations of metric components is shown here to give full access to the corresponding space-time geometry of weak-field gravity in terms of suitable line elements with quantum corrections. These results can be interpreted as providing covariant formulations of the gravitational force implied by a distribution of black holes in superposition. They can also be understood as a distribution of quantum matter constituents in superposition for a single black hole. A detailed analysis in the weak-field limit reveals quantum corrections to Newton’s potential in generic semiclassical states, as well as new bounds on quantum fluctuations, implied by the covariance condition, rather than the usual uncertainty principle. These results provide additional control on quantum effects in Newton’s potential that can be used in a broad range of predictions to be compared with observations.

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Sun May 26 2024 02:14:11 (6 days)

# 5.

]]>Niederklapfer, Alexander (2024) What is Fundamental in Fundamental Physics? [Preprint]