Diffeomorphism invariance and general covariance: a pedagogical introduction |

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Mateo Casariego

Fri May 17 2024 14:27:26 (17 hours)

# 1.

arXiv:2405.09703v1 Announce Type: cross Abstract: Diffeomorphism invariance is a feature that gets sometimes highlighted as something with profound implications in the physics of spacetime. Moreover, it is often wrongly associated exclusively with General Relativity. The fact that diffeomorphism invariance and general covariance are used interchangeably does not help. Here, we attempt at clarifying these concepts.

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Thu May 16 2024 16:12:17 (1 day)

# 2.

Ellerman, David (2024) A New Approach to Understanding Quantum Mechanics: Illustrated Using a Pedagogical Model over ℤ2. AppliedMath (MDPI), 4 (2). pp. 468-494.

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Thu May 16 2024 11:04:57 (1 day)

# 3.

Pipa, Francisco (2024) An indeterminacy-based ontology for quantum theory. [Preprint]

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Dawid Brzeminski and Anson Hook

Thu May 16 2024 06:00:00 (2 days)

# 4.

Author(s): Dawid Brzeminski and Anson Hook

The near equality of the dark matter and baryon energy densities is a remarkable coincidence, especially when one realizes that the baryon mass is exponentially sensitive to UV parameters in the form of dimensional transmutation. We explore a new dynamical mechanism, where in the presence of an arbi…

[Phys. Rev. Lett. 132, 201001] Published Thu May 16, 2024

arxiv > hep-th > arXiv:2405.09366

sQFT — an autonomous explanation of the interactions of quantum particles

K.-H. Rehren, L.T. Cardoso, C. Gass, J.M. Gracia-Bondía, B. Schroer, J.C. Várilly

]]>Successful applications of a conceptually novel setup of Quantum Field Theory, that accounts for all subtheories of the Standard Model (QED, Electroweak Interaction and Higgs, Yang-Mills and QCD) and beyond (Helicity 2), call for a perspective view in a broader conceptual context. The setting is “autonomous” in the sense of being intrinsically quantum. Its principles are: Hilbert space, Poincaré symmetry and causality. Its free quantum fields are obtained from Wigner’s unitary representations of the Poincaré group, with only physical and observable degrees of freedom. A “quantization” of an “underlying” classical theory is not needed. It allows renormalizable perturbation theory with interactions whose detailed structure, and in some cases even the particle content, is predicted by internal consistency. The results confirm and extend observable predictions for the interactions of the SM without assuming a “principle” of gauge invariance.

Equivalence Principle and Machian origin of extended gravity |

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Elmo Benedetto, Christian Corda, Ignazio Licata

Wed May 15 2024 11:34:05 (47 minutes)

# 1.

arXiv:2405.08024v1 Announce Type: new Abstract: Chae’s analyses on GAIA observations of wide binary stars have fortified the paradigm of extended gravity with particular attention to MOND-like theories. We recall that, starting from the origin of Einstein’s general relativity, the request of Mach on the structure of the theory has been the core of the foundational debate. This issue is strictly connected with the nature of the mass-energy equivalence. This was exactly the key point that Einstein used to derive the same general relativity. On the other hand, the current requirements of particle physics and the open questions within extended gravity theories, which have recently been further strengthened by analyses of GAIA observations, request a better understanding of the Equivalence Principle. By considering a direct coupling between the Ricci curvature scalar and the matter Lagrangian a non geodesic ratio between the inertial and the gravitational mass can be fixed and MOND-like theories are retrieved at low energies.

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Giorgio Torrieri

Wed May 15 2024 11:33:50 (47 minutes)

# 2.

arXiv:2405.08192v1 Announce Type: new Abstract: Assuming the validity of the equivalence principle in the quantum regime, we argue that one of the assumptions of the usual definition of quantum mechanics, namely separation between the “classical” detector and the “quantum” system, must be relaxed. We argue, therefore, that if both the equivalence principle and quantum mechanics continue to survive experimental tests, that this favors “epistemic” interpretations of quantum mechanics (where formalism is built around relations between observables) over “ontic ones” (assuming the reality of states and wavefunctions). In particular, we show that relational type interpretations can readily accomodate the equivalence principle via a minor modification of the assumptions used to justify the formalism. We qualitatively speculate what a full generally covariant quantum dynamics could look like, and comment on experimental investigations.

from

Mon May 13 2024 17:17:29 (1 day)

# 3.

Laudisa, Federico (2024) Bohr and von Neumann on the Universality of Quantum Mechanics: Materials for the History of the Quantum Measurement Process. [Preprint]

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Frank Wilczek

Thu May 09 2024 08:07:32 (6 days)

# 4.

arXiv:2405.04565v1 Announce Type: cross Abstract: If we consider a cat to be an isolated mechanical system governed by T-invariant mechanics, then its ability to land on its feet after being released from rest is incomprehensible. It is more appropriate to treat the cat as a creature that can change its shape in order to accomplish a purpose. Within that framework we can construct a useful and informative of the observed motion. One can learn from this example.

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Brian C. Lacki

Thu May 09 2024 08:07:31 (6 days)

# 5.

arXiv:2106.07738v2 Announce Type: replace Abstract: Typicality arguments attempt to use the Copernican Principle to draw conclusions about the cosmos and presently unknown conscious beings within it, including extraterrestrial intelligences (ETI). The most notorious is the Doomsday Argument, which purports to constrain humanity’s future from its current lifespan alone. These arguments rest on a likelihood calculation that penalizes models in proportion to the number of distinguishable observers. I argue that such reasoning leads to solipsism, the belief that one is the only being in the world, and is therefore unacceptable. Using variants of the “Sleeping Beauty” thought experiment as a guide, I present a framework for evaluating observations in a large cosmos: Weighted Fine Graining (WFG). WFG requires the construction of specific models of physical outcomes and observations. Valid typicality arguments then emerge from the combinatorial properties of third-person physical microhypotheses. Indexical (observer-relative) facts do not directly constrain physical theories, but instead weight different provisional evaluations of credence. As indexical knowledge changes, the weights shift. I show that the self-applied Doomsday Argument fails in WFG, even though it can work for an external observer. I argue that the Copernican Principle does not let us apply self-observations to constrain ETIs.

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Gustavo Rigolin

Thu May 09 2024 06:00:00 (6 days)

# 6.

Author(s): Gustavo Rigolin

We show that the Schrödinger equation can be derived assuming the Galilean covariance of a generic wave equation and the validity of the de Broglie’s wave-particle duality hypothesis. We also obtain from this set of assumptions the transformation law for the wave function under a Galilean boost and …

[Phys. Rev. A 109, 052209] Published Thu May 09, 2024

from

Wed May 08 2024 18:45:45 (6 days)

# 7.

de Ronde, Christian and Fernández Mouján, Raimundo and Massri, Cesar (2024) Everything is Entangled in Quantum Mechanics: Are the Orthodox Measures Physically Meaningful? [Preprint]

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Philippe Grangier

Tue May 07 2024 08:17:57 (1 week)

# 8.

arXiv:2405.03184v1 Announce Type: cross Abstract: In the foundations of quantum mechanics, the Kolmogorovian Censorship (KC) stipulates that quantum probabilities can be identified with classical, Kolmogorovian probabilities when considering a specified measurement context. Then in any given measurement context it is possible to build a Kolmogorovian probability distribution, or equivalently a hidden variable theory; however this distribution must be matched to the chosen context. In a loophole-free Bell test, the remote random choices of measurements (polarizers orientations) have the purpose to prevent that this matching can be obtained from any relativistically causal transmission between the source and the detectors. Then the matching (required to violate Bell’s inequalities) may be obtained either by an instantaneous influence at a distance between the source and the detectors (explicit nonlocality), or by assuming that it is pre-established before the actual experiment takes place (super-determinism). If both influence at a distance and super-determinism are not accepted on physical grounds, a third way is still available, called “predictive incompleteness”: it tells that the usual quantum state $\psi$ is incomplete, as long as the measurement context has not been specified. In agreement with the general quantum framework called CSM (Contexts, Systems and Modalities) we argue that predictive incompleteness is the correct quantum way to understand the violation of Bell’s inequalities.

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Jim Al-Khalili, Eddy Keming Chen

Tue May 07 2024 08:17:56 (1 week)

# 9.

]]>arXiv:2405.03418v1 Announce Type: cross Abstract: If an asymmetry in time does not arise from the fundamental dynamical laws of physics, it may be found in special boundary conditions. The argument normally goes that since thermodynamic entropy in the past is lower than in the future according to the Second Law of Thermodynamics, then tracing this back to the time around the Big Bang means the universe must have started off in a state of very low thermodynamic entropy: the Thermodynamic Past Hypothesis. In this paper, we consider another boundary condition that plays a similar role, but for the decoherent arrow of time, i.e. the quantum state of the universe is more mixed in the future than in the past. According to what we call the Entanglement Past Hypothesis, the initial quantum state of the universe had very low entanglement entropy. We clarify the content of the Entanglement Past Hypothesis, compare it with the Thermodynamic Past Hypothesis, and identify some challenges and open questions for future research.

Towards a Deterministic Interpretation of Quantum Mechanics: Insights from Dynamical Systems |

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Aminur Rahman

Fri May 03 2024 10:51:22 (1 day)

# 1.

arXiv:2405.00707v1 Announce Type: new Abstract: Experiments violating Bell’s inequality appear to indicate deterministic models do not correspond to a realistic theory of quantum mechanics. The theory of pilot waves seemingly overcomes this hurdle via nonlocality and statistical dependence, however it necessitates the existence of “ghost waves”. This manuscript develops a deterministic dynamical system with local interactions. The aggregate behavior of the trajectories are reminiscent of a quantum particle evolving under the Schr\”{o}dinger equation and reminiscent of Feynman’s path integral interpretation in three canonical examples: motion in free space, double slit diffraction, and superluminal barrier traversal. Moreover, the system bifurcates into various dynamical regimes including a classical limit. These results illustrate a deterministic alternative to probabilistic interpretations and aims to shed light on the transition from quantum to classical mechanics.

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Eddy Keming Chen

Fri May 03 2024 10:51:21 (1 day)

# 2.

arXiv:2405.01025v1 Announce Type: cross Abstract: Realism about quantum theory naturally leads to realism about the quantum state of the universe. It leaves open whether it is a pure state represented by a wave function, or an impure one represented by a density matrix. I characterize and elaborate on Density Matrix Realism, the thesis that the universal quantum state is objective but can be impure. To clarify the thesis, I compare it with Wave Function Realism, explain the conditions under which they are empirically equivalent, consider two generalizations of Density Matrix Realism, and answer some frequently asked questions. I end by highlighting an implication for scientific realism.

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Xerxes D. Arsiwalla

Fri May 03 2024 10:51:20 (1 day)

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arXiv:2405.01148v1 Announce Type: cross Abstract: This work explores the hypothesis that subjectively attributed meaning constitutes the phenomenal content of conscious experience. That is, phenomenal content is semantic. This form of subjective meaning manifests as an intrinsic and non-representational character of qualia. Empirically, subjective meaning is ubiquitous in conscious experiences. We point to phenomenological studies that lend evidence to support this. Furthermore, this notion of meaning closely relates to what Frege refers to as “sense”, in metaphysics and philosophy of language. It also aligns with Peirce’s “interpretant”, in semiotics. We discuss how Frege’s sense can also be extended to the raw feels of consciousness. Sense and reference both play a role in phenomenal experience. Moreover, within the context of the mind-matter relation, we provide a formalization of subjective meaning associated to one’s mental representations. Identifying the precise maps between the physical and mental domains, we argue that syntactic and semantic structures transcend language, and are realized within each of these domains. Formally, meaning is a relational attribute, realized via a map that interprets syntactic structures of a formal system within an appropriate semantic space. The image of this map within the mental domain is what is relevant for experience, and thus comprises the phenomenal content of qualia. We conclude with possible implications this may have for experience-based theories of consciousness.

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Lee A. Rozema, Teodor Str\”omberg, Huan Cao, Yu Guo, Bi-Heng Liu, Philip Walther

Fri May 03 2024 10:51:20 (1 day)

# 4.

arXiv:2405.00767v1 Announce Type: new Abstract: In the past decade, the toolkit of quantum information has been expanded to include processes in which the basic operations do not have definite causal relations. Originally considered in the context of the unification of quantum mechanics and general relativity, these causally indefinite processes have been shown to offer advantages in a wide variety of quantum information processing tasks, ranging from quantum computation to quantum metrology. Here we overview these advantages and the experimental efforts to realise them. We survey both the different experimental techniques employed, as well as theoretical methods developed in support of the experiments, before discussing the interpretations of current experimental results and giving an outlook on the future of the field.

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Leila Maghlaoui, Peter O. Hess

Fri May 03 2024 10:51:13 (1 day)

# 5.

arXiv:2405.01325v1 Announce Type: new Abstract: A brief review of the pseudo complex General Relativity (pcGR) will be presented, with its consequences, as the accumulation of a dark energy around a mass and a generalized Machs principle. The main objective in this contribution is to determine the Hawking temperature and the Entropy for various limits: i) The pc-Schwarzschild case with no minimal length present, ii) the pc-Kerr metric without a minimal length and iii) the general case, the pc-Kerr metric with a minimal length present. The physical consequences of a minimal length will be discussed, a possible interpretation of a gravitational Schwinger effect and the appearance of negative temperature. For large masses a minimal length does not show any sensible effect, but only for very small masses, several orders of the Planck mass, where non-trivial effects emerge, important for the production of mini-black holes in the early universe. Our results are more general than being restricted to pcGR. Any other model which assumes a distribution of dark energy around a stellar body produces the same effects. In contrast to these models, pcGR demands the presence of a dark energy term.

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Marco de Cesare

Fri May 03 2024 10:51:10 (1 day)

# 6.

arXiv:2405.01380v1 Announce Type: new Abstract: Different approaches to quantum gravity, such as loop quantum cosmology and group field theory, predict the resolution of the initial cosmological singularity via a ‘bounce’: a regular spacetime region that connects the expanding branch of the universe to a contracting branch. The cosmological arrow of time, which by definition points in the direction of cosmic expansion, is reversed at the bounce. Nonetheless, it is still possible to discriminate between the two branches by considering different arrows, as defined for instance by the growth of perturbations. After reviewing general aspects of the time arrow problem in cosmology, we examine the properties of different arrows of time in bouncing cosmologies, focusing on the loop quantum cosmology bounce as a case study. We also present a new exact solution to the effective Friedmann equations of loop quantum cosmology with pressureless dust and a cosmological constant, which is a simplified version of the $\Lambda$CDM bounce scenario, where these issues can be examined in detail.

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Eric Lantz, Fabrice Devaux, Serge Massar

Fri May 03 2024 10:51:04 (1 day)

# 7.

arXiv:2405.01050v1 Announce Type: new Abstract: Subtracting accidental coincidences is a common practice quantum optics experiments. For zero mean Gaussian states, such as squeezed vacuum, we show that if one removes accidental coincidences the measurement results are quantitatively the same, both for photon coincidences at very low flux and for intensity covariances. Consequently, pure quantum effects at the photon level, like interference of photon wave functions or photon bunching, are reproduced in the correlation of fluctuations of macroscopic beams issued from spontaneous down conversion. This is true both in experiment if the detection resolution is smaller than the coherence cell (size of the mode), and in stochastic simulations based on sampling the Wigner function. We discuss the limitations of this correspondence, such as Bell inequalities (for which one cannot substract accidental coincidences), highly multimode situations such as quantum imaging, and higher order correlations.

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Tae-Hun Lee and Jarosław K. Korbicz

Fri May 03 2024 06:00:00 (1 day)

# 8.

Author(s): Tae-Hun Lee and Jarosław K. Korbicz

We investigate quantum objectivity in the boson-spin model, where a central harmonic oscillator interacts with a thermal bath of spin-12 systems. We analyze how information about a continuous position variable can be encoded into discrete, finite-dimensional environments. More precisely, we study co…

[Phys. Rev. A 109, 052204] Published Fri May 03, 2024

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Thu May 02 2024 20:00:00 (1 day)

# 9.

Nature Physics, Published online: 03 May 2024; doi:10.1038/s41567-024-02463-7The Q-value of electron capture in 163Ho has been determined with an uncertainty of 0.6 eV c–2 through a combination of high-precision Penning-trap mass spectrometry and precise atomic physics calculations. This high-precision measurement provides insight into systematic errors in neutrino mass measurements.

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D V Red\v{z}i\’c

Wed May 01 2024 09:45:05 (3 days)

# 10.

arXiv:2404.19566v1 Announce Type: 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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Barak Shoshany, Zipora Stober

Tue Apr 30 2024 09:57:31 (4 days)

# 11.

arXiv:2303.07635v3 Announce Type: replace-cross Abstract: For time travel to be consistent with the known laws of physics, the resulting paradoxes must be resolved. It has been suggested that parallel timelines (a.k.a. multiple histories) may provide a resolution. However, so far, a concrete mechanism by which parallel timelines can be created has never been satisfactorily formulated. In this paper we propose such a mechanism within the framework of unmodified quantum mechanics, also known as the Everett or “many-worlds” interpretation. The timelines in our model are emergent, like the “worlds” of the Everett interpretation; they are created by quantum entanglement between the time machine and the environment. Therefore, we call them “entangled timelines” or E-CTCs. As the entanglement gradually spreads out to additional systems, the timelines spread out as well, providing a local and well-defined alternative to the naive “branching timelines” picture often presented in the literature. The E-CTC model is similar to Deutsch’s familiar D-CTC model, but differs from it mainly by making the entanglement explicit, which allows us to create a clearer practical definition of the resulting parallel timelines.

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Hans Christian \”Ottinger

Tue Apr 30 2024 09:57:30 (4 days)

# 12.

arXiv:2309.03151v2 Announce Type: replace-cross Abstract: The stochastic nature of quantum mechanics is more naturally reflected in a bilinear two-process representation of density matrices rather than in squared wave functions. This proposition comes with a remarkable change of the entanglement mechanism: entanglement effects do not originate from superpositions of wave functions, but result from the bilinear structure of density matrices. Quantum interference appears as a multiplicative phenomenon rather than an additive superposition mechanism. We propose two general requirements such that the bilinear representation of density matrices is given in terms of two uniquely defined, identically distributed, Markovian stochastic jump processes. These general ideas are illustrated for the Einstein-Podolsky-Rosen and double-slit experiments. The expression of the stochastic nature of quantum mechanics in terms of random variables rather than their probability distributions facilitates an ontological viewpoint and leads us to a bra-ket interpretation of quantum mechanics.

from

Tue Apr 30 2024 08:47:40 (4 days)

# 13.

Elohim, David (2014) Physical Necessitism. [Preprint]

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Tue Apr 30 2024 08:46:36 (4 days)

# 14.

François, Jordan and Berghofer, Philipp (2024) Dressing vs. Fixing: On How to Extract and Interpret Gauge-Invariant Content. [Preprint]

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Tue Apr 30 2024 08:44:37 (4 days)

# 15.

Chen, Eddy Keming (2022) Strong Determinism. [Preprint]

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Jordan Fran\c{c}ois, Lucrezia Ravera

Mon Apr 29 2024 10:20:33 (5 days)

# 16.

arXiv:2404.17449v1 Announce Type: new Abstract: We propose our account of the meaning of local symmetries. We argue that the general covariance principle and gauge principle both are principles of democratic epistemic access to the law of physics, leading to ontological insights about the objective nature of spacetime. We further argue that relationality is a core notion of general-relativistic gauge field theory, tacitly encoded by its (active) local symmetries.

from

Mon Apr 29 2024 09:53:45 (5 days)

# 17.

Shanahan, Daniel (2024) The de Broglie wave as an undulatory distortion induced in the moving particle by the failure of simultaneity. [Preprint]

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Mon Apr 29 2024 09:48:36 (5 days)

# 18.

François, Jordan and Ravera, Lucrezia (2024) On the Meaning of Local Symmetries: Epistemic-Ontological Dialectics. [Preprint]

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Isaac Friend and Aleks Kissinger

Mon Apr 29 2024 06:00:00 (5 days)

# 19.

Author(s): Isaac Friend and Aleks Kissinger

Recent years have seen great interest in extending causal inference concepts developed in the context of classical statistical models to quantum theory. So far, this program has only barely addressed causal identification, a type of causal inference problem concerned with recovering from observation…

[Phys. Rev. A 109, 042214] Published Mon Apr 29, 2024

from

Mon Apr 29 2024 00:26:14 (5 days)

# 20.

]]>de Ronde, Christian and Fernández Mouján, Raimundo and Massri, Cesar (2024) Equivalence Relations in Quantum Theory: An Objective Account of Bases and Factorizations. [Preprint]

Emergence-Free Duality: Phonons and Vibrating Atoms in Crystalline Solids |

from philsciFri Apr 26 2024 22:46:17 (11 hours)# 1.

Fortin, Sebastian and Pasqualini, Matias (2023) Emergence-Free Duality: Phonons and Vibrating Atoms in Crystalline Solids. [Preprint]

from philsciFri Apr 26 2024 22:41:11 (11 hours)# 2.

Wallace, David (2024) Gauge Invariance Through Gauge Fixing. [Preprint]

from philsciFri Apr 26 2024 22:40:47 (11 hours)# 3.

de Ronde, Christian and Massri, Cesar (2024) Equivalence Relations in Quantum Theory: An Objective Account of Bases and Factorizations. [Preprint]

from philsciFri Apr 26 2024 22:40:05 (11 hours)# 4.

Adlam, Emily (2024) Against Self-Location. [Preprint]

from philsciFri Apr 26 2024 22:39:19 (11 hours)# 5.

Jacobs, Caspar (2024) How (Not) to Define Inertial Frames. [Preprint]

from philsciFri Apr 26 2024 22:38:41 (11 hours)# 6.

Weinberger, Naftali (2019) Reintroducing Dynamics into Static Causal Models.

from physics.hist-ph by David H. WolpertFri Apr 26 2024 12:01:39 (22 hours)# 7.

arXiv:2404.16050v1 Announce Type: cross Abstract: The simulation hypothesis has recently excited renewed interest, especially in the physics and philosophy communities. However, the hypothesis specifically concerns {computers} that simulate physical universes, which means that to properly investigate it we need to couple computer science theory with physics. Here I do this by exploiting the physical Church-Turing thesis. This allows me to introduce a preliminary investigation of some of the computer science theoretic aspects of the simulation hypothesis. In particular, building on Kleene’s second recursion theorem, I prove that it is mathematically possible for us to be in a simulation that is being run on a computer \textit{by us}. In such a case, there would be two identical instances of us; the question of which of those is “really us” is meaningless. I also show how Rice’s theorem provides some interesting impossibility results concerning simulation and self-simulation; briefly describe the philosophical implications of fully homomorphic encryption for (self-)simulation; briefly investigate the graphical structure of universes simulating universes simulating universes, among other issues. I end by describing some of the possible avenues for future research that this preliminary investigation reveals.

from physics.hist-ph by Jonte R. Hance, Tomonori Matsushita, Holger F. HofmannFri Apr 26 2024 12:01:38 (22 hours)# 8.

arXiv:2404.16477v1 Announce Type: cross Abstract: The presence of an absorber in one of the paths of an interferometer changes the output statistics of that interferometer in a fundamental manner. Since the individual quantum particles detected at any of the outputs of the interferometer have not been absorbed, any non-trivial effect of the absorber on the distribution of these particles over these paths is a counterfactual effect. Here, we quantify counterfactual effects by evaluating the information about the presence or absence of the absorber obtained from the output statistics, distinguishing between classical and quantum counterfactual effects. We identify the counterfactual gain which quantifies the advantage of quantum counterfactual protocols over classical counterfactual protocols, and show that this counterfactual gain can be separated into two terms: a semi-classical term related to the amplitude blocked by the absorber, and a Kirkwood-Dirac quasiprobability assigning a joint probability to the blocked path and the output port. A negative Kirkwood-Dirac term between a path and an output port indicates that inserting the absorber into that path will have a focussing effect, increasing the probability of particles arriving at that output port, resulting in a significant enhancement of the counterfactual gain. We show that the magnitude of quantum counterfactual effects cannot be explained by a simple removal of the absorbed particles, but originates instead from a well-defined back-action effect caused by the presence of the absorber in one path, on particles in other paths.

from physics.hist-ph by W. M. Stuckey, Michael Silberstein, Timothy McDevittTue Apr 23 2024 11:39:48 (3 days)# 9.

arXiv:2404.13064v1 Announce Type: cross Abstract: We explain how the disparate kinematics of quantum mechanics (finite-dimensional Hilbert space of QM) and special relativity (Minkowski spacetime from the Lorentz transformations of SR) can both be based on one principle (relativity principle). This is made possible by the axiomatic reconstruction of QM via information-theoretic principles, which has successfully recast QM as a principle theory a la SR. That is, in the quantum reconstruction program (QRP) and SR, the formalisms (Hilbert space and Lorentz transformations, respectively) are derived from empirically discovered facts (Information Invariance & Continuity and light postulate, respectively), so QM and SR are “principle theories” as defined by Einstein. While SR has a compelling fundamental principle to justify its empirically discovered fact (relativity principle), QRP has not produced a compelling fundamental principle or causal mechanism to account for its empirically discovered fact. To unify these disparate kinematics, we show how the relativity principle (“no preferred reference frame” NPRF) can also be used to justify Information Invariance & Continuity. We do this by showing that when QRP’s operational notion of measurement is spatialized, Information Invariance & Continuity entails the empirically discovered fact that everyone measures the same value for Planck’s constant h, regardless of their relative spatial orientations or locations (Planck postulate). Since Poincare transformations relate inertial reference frames via spatial rotations and translations as well as boosts, the relativity principle justifies the Planck postulate just like it justifies the light postulate. Essentially, NPRF + c is an adynamical global constraint over the spacetime configuration of worldtubes for bodily objects while NPRF + h is an adynamical global constraint over the distribution of quanta among those bodily objects.

from physics.hist-ph by Huw PriceTue Apr 23 2024 11:39:47 (3 days)# 10.

arXiv:2404.13928v1 Announce Type: cross Abstract: In previous work with Ken Wharton, I have proposed that Bell correlations are a special sort of selection artefact, explained by a combination of (i) collider bias and (ii) a boundary constraint on the collider variable. This hypothesis requires no direct causal influence outside lightcones, and may hence offer a new way to reconcile Bell nonlocality and relativity. This piece outlines a new argument for the proposal. It explains how it is valid for a special class of (W-shaped) Bell experiments involving delayed-choice entanglement swapping, and argues that it can be extended to the general (V-shaped) case.

from physics.hist-ph by Erik H{\o}gTue Apr 23 2024 11:39:46 (3 days)# 11.

arXiv:2402.10996v2 Announce Type: replace-cross Abstract: In 1953 I heard of an experiment in 1925 by Bengt Str\”omgren where he observed transit times with the meridian circle at the Copenhagen University Observatory measuring the current in a photocell behind slits when a star was crossing. In 1954 just 22 years old I was given the task as a student to make first test observations with a new meridian circle of the observatory. I became fascinated by the instrument and by the importance of astrometry for astronomy. Work at four meridian circles, two in Denmark, one in Hamburg, one in Lund, and Pierre Lacroute’s vision of space astrometry in France had by 1973 created the foundation for development of the Hipparcos satellite, and Gaia followed. In 2013 I proposed a successor satellite which has gained momentum especially thanks to the efforts of David Hobbs and it has a good chance to be launched by ESA about 2045. But 70 years ago, optical astrometry was considered a dying branch of astronomy, unattractive compared with astrophysics. The following growth built on the still active interest in astrometry in Europe in those years and it was supported by ESA, the European Space Agency. This review is only about astrometry where I was personally involved.

from philsciMon Apr 22 2024 22:56:34 (4 days)# 12.

Gao, Shan (2024) Why the global phase is not real. Foundations of Physics, 54 (19). ISSN 1572-9516

from physics.hist-ph by Simon SaundersMon Apr 22 2024 11:58:22 (4 days)# 13.

arXiv:2404.12954v1 Announce Type: cross Abstract: I show that frequentism, as an explanation of probability in classical statistical mechanics, can be extended in a natural way to a decoherent quantum history space, the analogue of a classical phase space. The result is further a form of finite frequentism, in which the Gibbs concept of an infinite ensemble of gases is replaced by the total quantum state expressed in terms of the decoherence basis, as defined by the history space. It is a form of finite and actual frequentism (as opposed to hypothetical frequentism), insofar as all the microstates exist, in keeping with the decoherence-based Everett interpretation, and some versions of pilot-wave theory.

from physics.hist-ph by Nicola BamontiMon Apr 22 2024 11:58:21 (4 days)# 14.

]]>arXiv:2307.09338v2 Announce Type: replace Abstract: In General Relativity, reference frames must be distinguished from coordinates. The former represent physical systems interacting with the gravitational system, aside from possible approximations, while the latter are mathematical artefacts. We propose a novel three-fold distinction between Idealised Reference Frames, Dynamical Reference Frames and Real Reference Frames. In doing so, the paper not only clarifies the physical significance of reference frames, but also sheds light on the similarities between idealised reference frames and coordinates. It also analyses the salience of reference frames to define local Dirac observables and to propose a physical interpretation to diffeomorphism gauge symmetry.

The quantum gravity seeds for laws of nature |

from physics.hist-ph by Vincent Lam, Daniele OritiFri Apr 19 2024 10:13:01 (1 day)# 1.

arXiv:2404.12248v1 Announce Type: new Abstract: We discuss the challenges that the standard (Humean and non-Humean) accounts of laws face within the framework of quantum gravity where space and time may not be fundamental. This paper identifies core (meta)physical features that cut across a number of quantum gravity approaches and formalisms and that provide seeds for articulating updated conceptions that could account for QG laws not involving any spatio-temporal notions. To this aim, we will in particular highlight the constitutive roles of quantum entanglement, quantum transition amplitudes and quantum causal histories. These features also stress the fruitful overlap between quantum gravity and quantum information theory.

from quant-ph by Tobias HaasFri Apr 19 2024 10:12:44 (1 day)# 2.

arXiv:2404.12320v1 Announce Type: new Abstract: The area law-like scaling of local quantum entropies is the central characteristic of the entanglement inherent in quantum fields, many-body systems, and spacetime. Whilst the area law is primarily associated with the entanglement structure of the underlying quantum state, we here show that it equally manifests in classical entropies over measurement distributions when vacuum contributions dictated by the uncertainty principle are subtracted. Using the examples of the Gaussian ground and thermal states, but also the non-Gaussian particle state of a relativistic scalar field, we present analytical and numerical area laws for the entropies of various distributions and unveil how quantities of widespread interest such as the central charge and the (local) temperature are encoded in classical observables. With our approach, quantum entropies are no longer necessary to probe quantum phenomena, thereby rendering area laws and other quantum features directly accessible to theoretical models of high complexity as well as state-of-the-art experiments.

from PRL by Harry E. Dyte, George Gillard, Santanu Manna, Saimon F. Covre da Silva, Armando Rastelli, and Evgeny A. ChekhovichFri Apr 19 2024 06:00:00 (1 day)# 3.

Author(s): Harry E. Dyte, George Gillard, Santanu Manna, Saimon F. Covre da Silva, Armando Rastelli, and Evgeny A. Chekhovich

The measurement problem dates back to the dawn of quantum mechanics. Here, we measure a quantum dot electron spin qubit through off-resonant coupling with a highly redundant ancilla, consisting of thousands of nuclear spins. Large redundancy allows for single-shot measurement with high fidelity ≈99.…

[Phys. Rev. Lett. 132, 160804] Published Fri Apr 19, 2024

from philsciThu Apr 18 2024 06:40:22 (2 days)# 4.

Davis, Cruz (2024) Non-Spatial Matters: On the Possibility of Non-Spatial Material Objects. UNSPECIFIED.

from philsciThu Apr 18 2024 06:39:21 (2 days)# 5.

Margoni, Emilia and Oriti, Daniele (2024) The emergence of spacetime: what role for functionalism? [Preprint]

from physics.hist-ph by Henrique GomesWed Apr 17 2024 12:35:15 (2 days)# 6.

arXiv:2404.10461v1 Announce Type: cross Abstract: In general relativity, the strong equivalence principle is underpinned by a geometrical interpretation of fields on spacetime: all fields and bodies probe the same geometry. This geometric interpretation implies that the parallel transport of all spacetime tensors and spinors is dictated by a single affine connection. Can something similar be said about gauge theory? Agreed, in gauge theory different symmetry groups rule the interactions of different types of charges, so we cannot expect to find the same kind of universality found in the gravitational case. Nonetheless, the parallel transport of all the fields that are charged under the same symmetry group is dictated by a single ‘gauge connection’, and they all transform jointly under a gauge transformation. Is this kind of ‘restricted universality’ as geometrically underpinned as in general relativity? Here I argue that it is. The key difference is that the gauge geometry concerns ‘internal’, as opposed to ‘external’, spaces. The gauge symmetry of the standard model is thus understood as merely the automorphism group of an internal geometric structure — $C^3\otimes C^2\otimes C^1$ endowed with an orientation and canonical inner product — in the same way as spacetime symmetries (such as Poincare transformations), are understood as the automorphism group of an external geometric structure (respectively, a Minkowski metric). And the Ehresmann connection can then be understood as determining parallelism for this internal geometry.

from philsciTue Apr 16 2024 23:51:23 (3 days)# 7.

Ryder, Dominic J. (2024) The Black Hole Idealization Paradox. [Preprint]

from philsciTue Apr 16 2024 23:50:25 (3 days)# 8.

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

from philsciTue Apr 16 2024 23:48:01 (3 days)# 9.

Baron, Samuel and Le Bihan, Baptiste and Read, James (2024) Physical Theory and Physical Possibility. [Preprint]

from philsciTue Apr 16 2024 23:44:53 (3 days)# 10.

Feintzeig, Benjamin (2024) Quantization and the Preservation of Structure across Theory Change. [Preprint]

from nature-physicsMon Apr 15 2024 20:00:00 (4 days)# 11.

Nature Physics, Published online: 16 April 2024; doi:10.1038/s41567-024-02488-yEighty years on from the publication of Erwin Schrödinger’s interdisciplinary analysis on the origin of order in living organisms — What is Life? — we look at how physicists and biologists are approaching the topic today.

from philsciSun Apr 14 2024 17:10:12 (5 days)# 12.

Del Santo, Flavio and Gisin, Nicolas (2024) Creative and geometric times in physics, mathematics, logic, and philosophy. [Preprint]

from philsciSun Apr 14 2024 17:10:07 (5 days)# 13.

]]>Ellerman, David (2024) A New Approach to Understanding Quantum Mechanics: Illustrated Using a Pedagogical Model over Z2. Applied Math, 4 (2). 468-494..

The classical-quantum hybrid canonical dynamics and its difficulties with special and general relativity |

from gr-qc by Lajos Di\’osiFri Apr 12 2024 14:58:09 (18 hours)# 1.

arXiv:2404.07723v1 Announce Type: new Abstract: We discuss the Hamiltonian hybrid coupling between a classical and a quantum subsystem. If applicable to classical gravity coupled to quantized matter, this hybrid theory might realize a captivating `postquantum’ alternative to full quantum-gravity. We summarize the nonrelativistic hybrid dynamics in improved formalism adequate to Hamiltonian systems. The mandatory decoherence and diffusion terms become divergent in special and general relativistic extensions. It is not yet known if any renormalization method might reconcile Markovian decoherence and diffusion with relativity. Postquantum gravity could previously only be realized in the Newtonian approximation. We argue that pending problems of the recently proposed general relativistic postquantum theory will not be solved if Markovian diffusion/decoherence are truly incompatible with relativity.

from quant-ph by Kaumudibikash Goswami, Giulio ChiribellaFri Apr 12 2024 14:58:00 (18 hours)# 2.

arXiv:2404.07683v1 Announce Type: new Abstract: We introduce two quantitative measures of the strength of causal relations. These two measures capture the maximum and minimum changes in a quantum system induced by changes in another system. We show that both measures possess important properties, such as continuity and faithfulness, and can be evaluated through optimization over orthogonal input states. For the maximum causal effect, we provide numerical lower bounds based on a variational algorithm, which can be used to estimate the strength of causal relations without performing a full quantum process tomography. To illustrate the application of our algorithm, we analyze two paradigmatic examples, the first involving a coherent superposition of direct cause and common cause and the second involving communication through a coherent superposition of two completely depolarizing channels.

from PRL by Stefan Antusch, Admir Greljo, Ben A. Stefanek, and Anders Eller ThomsenFri Apr 12 2024 06:00:00 (1 day)# 3.

Author(s): Stefan Antusch, Admir Greljo, Ben A. Stefanek, and Anders Eller Thomsen

We posit that the distinct patterns observed in fermion masses and mixings are due to a minimally broken U(2)�+� flavor symmetry acting on left-handed quarks and right-handed charged leptons, giving rise to an accidental U(2)5 symmetry at the renormalizable level without imposing selection rules on …

[Phys. Rev. Lett. 132, 151802] Published Fri Apr 12, 2024

from PRL by Reza Javadinezhad and Massimo PorratiFri Apr 12 2024 06:00:00 (1 day)# 4.

Author(s): Reza Javadinezhad and Massimo Porrati

We describe and solve three puzzles arising in covariant and supertranslation-invariant formulas for the flux of angular momentum and other Lorentz charges in asymptotically flat spacetimes: (i) Supertranslation invariance and covariance imply invariance under spacetime translations; (ii) the flux d…

[Phys. Rev. Lett. 132, 151604] Published Fri Apr 12, 2024

from physics.hist-ph by Flavio Del Santo, Nicolas GisinThu Apr 11 2024 11:52:20 (1 day)# 5.

arXiv:2404.06566v1 Announce Type: new Abstract: We propose a distinction between two different concepts of time that play a role in physics: geometric time and creative time. The former is the time of deterministic physics and merely parametrizes a given evolution. The latter is instead characterized by real change, i.e. novel information that gets created when a non-necessary event becomes determined in a fundamentally indeterministic physics. This allows us to give a naturalistic characterization of the present as the moment that separates the potential future from the determined past. We discuss how these two concepts find natural applications in classical and intuitionistic mathematics, respectively, and in classical and multivalued tensed logic, as well as how they relate to the well-known A- and B-theories in the philosophy of time.

from PRA – fundamentalconcepts by Shubhayan SarkarThu Apr 11 2024 06:00:00 (2 days)# 6.

Author(s): Shubhayan Sarkar

The work challenges the concept of “classical independence” between physical systems by demonstrating that within quantum theory two systems can affect each other despite no observable changes, unveiling the interconnected nature of the quantum world. The findings also unveil potential applications for device-independent certification of quantum states and measurements.

[Phys. Rev. A 109, L040202] Published Thu Apr 11, 2024

from physics.hist-ph by Aur\’elien DrezetWed Apr 10 2024 10:24:31 (2 days)# 7.

arXiv:2404.06366v1 Announce Type: new Abstract: In this note, we discuss a historical point regarding Schr\”odinger’s discovery of the famous quantum wave equation in 1926 following de Broglie’s fundamental works published in 1923-1925 regarding the introduction of matter waves. Drawing on the work of historians and personal analysis, we show that de Broglie was very close to the discovery of the Schr\”odinger equation (at least for the stationary one-electron problem).

from philsciTue Apr 09 2024 18:34:23 (3 days)# 8.

]]>Oddan, Jessica (2024) Reconstructions of Quantum Theory: Methodology and the Role of Axiomatization. [Preprint]

A new indeterminacy-based quantum theory |

from physics.hist-ph by Francisco PipaFri Apr 05 2024 13:06:36 (21 hours)# 1.

arXiv:2310.04002v4 Announce Type: replace-cross Abstract: I propose a novel (interpretation of) quantum theory, which I will call Environmental Determinacy-based or EnD Quantum Theory (EnDQT). In contrast to the well-known quantum theories, EnDQT has the benefit of not adding hidden variables, and it is not in tension with relativistic causality by providing a local causal explanation of quantum correlations without measurement outcomes varying according to, for example, systems or worlds. It is conservative, and so unlike theories such as spontaneous collapse theories, no modifications of the fundamental equations of quantum theory are required to establish when determinate values arise, and in principle, arbitrary systems can be in a superposition for an arbitrary amount of time. According to EnDQT, some systems acquire determinate values at some point, and the capacity to have and give rise to determinate values through interactions propagates to other systems via local interactions. When systems are isolated from the systems that belong to these chains of interactions, they can, in principle, evolve unitarily indefinitely. EnDQT provides a series of novel empirical posits that may distinguish it from other interpretations of quantum theory. Furthermore, via its characterization of the systems that start these chains of interactions, it provides possible payoffs to other areas of physics and their foundations, such as cosmology, thermodynamics, and statistical mechanics.

from gr-qc by Sebastian Bahamonde, Daniel Blixt, Konstantinos F. Dialektopoulos, Anamaria HellFri Apr 05 2024 13:05:10 (21 hours)# 2.

arXiv:2404.02972v1 Announce Type: new Abstract: We study the degrees of freedom in New General Relativity — flat and metric compatible family of theories — around the Minkowski background in a gauge invariant manner. First, we confirm the decoupling case, in which the theory reduces to linearized gravity plus a massless KR field. We then show that, unless they vanish, the vector modes of this theory will be ghosts. In addition, we find two new branches of the theories, which are ghost-free and propagate linearly two tensor modes and in one of the cases also a massless scalar field. This shows that while the generic theory is ill-behaved, there are three possible realizations of ghost-free cases, in contradiction to the previous literature, which states that there is only one ghost-free theory in addition to general relativity.

from quant-ph by Peter Asenbaum, Chris Overstreet, Mark A. KasevichFri Apr 05 2024 13:05:04 (21 hours)# 3.

arXiv:2404.03057v1 Announce Type: new Abstract: In a uniform gravitational field, classical test objects fall universally. Any reference object or observer will fall in the same universal manner. Therefore, a uniform gravitational field cannot create dynamics between observers and classical test objects. The influence of a uniform gravitational field on matter waves and clocks, however, is described inconsistently throughout research and education. To illustrate, we discuss the behavior of a matter-wave interferometer and a clock redshift experiment in a uniform gravitational field. As a consistent formulation of the equivalence principle implies, a uniform gravitational field has no observable influence on these systems and is physically equivalent to the absence of gravity.

from gr-qc by Yang Liu, Antonio Padilla, Francisco G. PedroFri Apr 05 2024 13:05:01 (21 hours)# 4.

arXiv:2404.02961v1 Announce Type: cross Abstract: We examine the descent via membrane nucleation through a landscape of vacua where the cosmological constant is given by a combination of four-form fluxes. It has been shown that this descent can be slowed exponentially for very low curvature vacua close to Minkowski space in a wide class of models satisfying certain parametric conditions, providing a possible solution to the cosmological constant problem. We explore in detail whether or not those parametric conditions are compatible with the membrane weak gravity conjecture. Whilst it is true that there is often tension, we show that this is not always the case and present an explicit model where Minkowski space is absolutely stable and the weak gravity conjecture is satisfied. This corresponds to an extension of the Bousso-Polchinski model into a generalised DBI action for four-forms. We also clarify how the landscape should be populated in a consistent model.

from physics.hist-ph by Anne-Catherine de la Hamette, Viktoria Kabel, \v{C}aslav BruknerTue Apr 02 2024 15:06:52 (3 days)# 5.

arXiv:2404.00159v1 Announce Type: cross Abstract: We explore the notion of events at the intersection between quantum physics and gravity, inspired by recent research on superpositions of semiclassical spacetimes. By going through various experiments and thought experiments — from a decaying atom, to the double-slit experiment, to the quantum switch — we analyse which properties can and cannot be used to define events in such non-classical contexts. Our findings suggest an operational, context-dependent definition of events which emphasises that their properties can be accessed without destroying or altering observed phenomena. We discuss the implications of this understanding of events for indefinite causal order as well as the non-absoluteness of events in the Wigner’s friend thought experiment. These findings provide a first step for developing a notion of event in quantum spacetime.

from APS selected papers by Michael SchirberTue Apr 02 2024 06:00:00 (4 days)# 6.

Author(s): Michael Schirber

David Kaplan has developed a lattice model for particles that are left- or right-handed, offering a firmer foundation for the theory of weak interactions.

[Physics 17, 54] Published Tue Apr 02, 2024

from physics.hist-ph by Christian Hugo HoffmannMon Apr 01 2024 10:38:19 (4 days)# 7.

arXiv:2403.19658v1 Announce Type: new Abstract: This paper addresses the central question of what a coherent concept of probability might look like that would do justice to both classical probability theory, axiomatized by Kolmogorov, and quantum theory. At a time when quanta are receiving increased and expanded attention — think, for example, of the advances in quantum computers or the promises associated with this new technology (National Academies of Sciences: Engineering, and Medicine, 2019) — an adequate interpretation of probability, which is no less important, should be given due attention, particularly with regard to quantum theory.

from physics.hist-ph by Navinder SinghMon Apr 01 2024 10:38:18 (4 days)# 8.

arXiv:2403.19682v1 Announce Type: new Abstract: As is well known, Paul Drude put forward the very first quantitative theory of electrical conduction in metals in 1900. He could successfully account for the Wiedemann-Franz law which states that the ratio of thermal to electrical conductivity divided by temperature is a constant called the Lorenz number. As it turns out, in Drude’s derivation, there is a lucky cancellation of two errors. Drude’s under-estimate (by an order of 100) of the value of square of the average electron velocity compensated his over-estimate of the electronic heat capacity (by the same order of 100). This compensation or cancellation of two errors lead to a value of the Lorenz number very close to its experimental value. This is well known. There is another error of a factor of two which Drude made when he calculated two different relaxation times for heat conductivity and electrical conductivity. In this article we highlight how and why this error occurred in Drude’s derivation and how it was removed 5 years later (that is in 1905) by Hendrik Lorentz when he used the Boltzmann equation and a single relaxation time. This article is of pedagogical value and may be useful to undergraduate/graduate students learning solid state physics.

from philsciMon Apr 01 2024 05:39:31 (5 days)# 9.

Fay, Jonathan (2023) On the Relativity of Magnitudes: Delboeuf’s forgotten contribution to the 19th Century problem of space. [Preprint]

from philsciMon Apr 01 2024 05:31:10 (5 days)# 10.

Lewis, Peter J. (2021) Explicating quantum indeterminacy. [Preprint]

from philsciMon Apr 01 2024 05:30:51 (5 days)# 11.

]]>Lewis, Peter J. and Jhou, Nihel (2021) The Indeterminate Present. [Preprint]

Learning to Represent: Mathematics-first accounts of representation and their relation to natural language |

from philsciSun Mar 24 2024 01:37:01 (6 days)# 10.

Wallace, David (2024) Learning to Represent: Mathematics-first accounts of representation and their relation to natural language. [Preprint]

from gr-qc by Jonathan SorceFri Mar 29 2024 17:22:32 (1 day)# 1.

arXiv:2403.18937v1 Announce Type: cross Abstract: The Unruh effect can be formulated as the statement that the Minkowski vacuum in a Rindler wedge has a boost as its modular flow. In recent years, other examples of states with geometrically local modular flow have played important roles in understanding energy and entropy in quantum field theory and quantum gravity. Here I initiate a general study of the settings in which geometric modular flow can arise, showing (i) that any geometric modular flow must be a conformal symmetry of the background spacetime, and (ii) that in a well behaved class of “weakly analytic” states, geometric modular flow must be future-directed. I further argue that if a geometric transformation is conformal but not isometric, then it can only be realized as modular flow in a conformal field theory. Finally, I discuss a few settings in which converse results can be shown — i.e., settings in which a state can be constructed whose modular flow reproduces a given vector field.

from gr-qc by J. J. Relancio, L. Santamar\’ia-SanzFri Mar 29 2024 17:22:27 (1 day)# 2.

arXiv:2403.19520v1 Announce Type: cross Abstract: In this work, we present the technical details of the discussion presented in [J.J. Relancio, L.Santamar\’ia-Sanz (2024) arXiv:2403.18772], where we establish the basis of quantum theories of the free massive scalar, the massive fermionic, and the electromagnetic fields, in a doubly special relativity scenario. This construction is based on a geometrical interpretation of the kinematics of these kind of theories. In order to describe the modified actions, we find that a higher (indeed infinite) derivative field theory is needed, from which the deformed kinematics can be read. From our construction we are able to restrict the possible models of doubly special relativity to particular bases that preserve linear Lorentz invariance. We quantize the theories and also obtain a deformed version of the Maxwell equations. We analyze the electromagnetic vector potential either for an electric point-like source and a magnetic dipole. We observe that the electric and magnetic fields do not diverge at the origin for some models described with an anti de Sitter space but do for the de Sitter one in both problems.

from philsciWed Mar 27 2024 11:28:52 (3 days)# 3.

March, Eleanor (2024) Are Maxwell gravitation and Newton-Cartan theory theoretically equivalent? [Preprint]

from philsciWed Mar 27 2024 11:21:57 (3 days)# 4.

Slowik, Edward (2024) Emergent Spatial Ontologies in the Early Modern Period. In: UNSPECIFIED.

from physics.hist-ph by M. ShifmanWed Mar 27 2024 10:20:25 (3 days)# 5.

arXiv:2401.11027v2 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.

from physics.hist-ph by Jonte R. Hance, Sabine HossenfelderTue Mar 26 2024 09:00:19 (4 days)# 6.

arXiv:2204.01768v3 Announce Type: replace-cross Abstract: It was recently argued by Catani et al that it is possible to reproduce the phenomenology of quantum interference classically, by the double-slit experiment with a deterministic, local, and classical model (Quantum 7, 1119 (2023)). The stated aim of their argument is to falsify the claim made by Feynman (in his third book of Lectures on Physics) that quantum interference is “impossible, absolutely impossible, to explain in any classical way” and that it “contains the only mystery” of quantum mechanics. We here want to point out some problems with their argument.

from nature-physics by R. Abbasi; M. Ackermann; J. Adams; S. K. Agarwalla; J. A. Aguilar; M. Ahlers; J. M. Alameddine; N. M. Amin; K. Andeen; G. Anton; C. Argüelles; Y. Ashida; S. Athanasiadou; L. Ausborm; S. N. Axani; X. Bai; A. Balagopal V; M. Baricevic; S. W. Barwick; V. Basu; R. Bay; J. J. Beatty; J. Becker Tjus; J. Beise; C. Bellenghi; C. Benning; S. BenZvi; D. Berley; E. Bernardini; D. Z. Besson; E. Blaufuss; S. Blot; F. Bontempo; J. Y. Book; C. Boscolo Meneguolo; S. Böser; O. Botner; J. Böttcher; J. Braun; B. Brinson; J. Brostean-Kaiser; L. Brusa; R. T. Burley; R. S. Busse; D. Butterfield; M. A. Campana; K. Carloni; E. G. Carnie-Bronca; S. Chattopadhyay; N. Chau; C. Chen; Z. Chen; D. Chirkin; S. Choi; B. A. Clark; A. Coleman; G. H. Collin; A. Connolly; J. M. Conrad; P. Coppin; P. Correa; D. F. Cowen; P. Dave; C. De Clercq; J. J. DeLaunay; D. Delgado; S. Deng; K. Deoskar; A. Desai; P. Desiati; K. D. de Vries; G. de Wasseige; T. DeYoung; A. Diaz; J. C. Díaz-Vélez; M. Dittmer; A. Domi; H. Dujmovic; M. A. DuVernois; T. Ehrhardt; A. Eimer; P. Eller; E. Ellinger; S. El Mentawi; D. Elsässer; R. Engel; H. Erpenbeck; J. Evans; P. A. Evenson; K. L. Fan; K. Fang; K. Farrag; A. R. Fazely; A. Fedynitch; N. Feigl; S. Fiedlschuster; C. Finley; L. Fischer; D. Fox; A. Franckowiak; P. Fürst; J. Gallagher; E. Ganster; A. Garcia; L. Gerhardt; A. Ghadimi; C. Glaser; T. Glüsenkamp; J. G. Gonzalez; D. Grant; S. J. Gray; O. Gries; S. Griffin; S. Griswold; K. M. Groth; C. Günther; P. Gutjahr; C. Ha; C. Haack; A. Hallgren; R. Halliday; L. Halve; F. Halzen; H. Hamdaoui; M. Ha Minh; M. Handt; K. Hanson; J. Hardin; A. A. Harnisch; P. Hatch; A. Haungs; J. Häußler; K. Helbing; J. Hellrung; J. Hermannsgabner; L. Heuermann; N. Heyer; S. Hickford; A. Hidvegi; C. Hill; G. C. Hill; K. D. Hoffman; S. Hori; K. Hoshina; W. Hou; T. Huber; K. Hultqvist; M. Hünnefeld; R. Hussain; K. Hymon; S. In; A. Ishihara; M. Jacquart; O. Janik; M. Jansson; G. S. Japaridze; M. Jeong; M. Jin; B. J. P. Jones; N. Kamp; D. Kang; W. Kang; X. Kang; A. Kappes; D. Kappesser; L. Kardum; T. Karg; M. Karl; A. Karle; A. Katil; U. Katz; M. Kauer; J. L. Kelley; A. Khatee Zathul; A. Kheirandish; J. Kiryluk; S. R. Klein; A. Kochocki; R. Koirala; H. Kolanoski; T. Kontrimas; L. Köpke; C. Kopper; D. J. Koskinen; P. Koundal; M. Kovacevich; M. Kowalski; T. Kozynets; J. Krishnamoorthi; K. Kruiswijk; E. Krupczak; A. Kumar; E. Kun; N. Kurahashi; N. Lad; C. Lagunas Gualda; M. Lamoureux; M. J. Larson; S. Latseva; F. Lauber; J. P. Lazar; J. W. Lee; K. Leonard DeHolton; A. Leszczyńska; M. Lincetto; Y. Liu; M. Liubarska; E. Lohfink; C. Love; C. J. Lozano Mariscal; L. Lu; F. Lucarelli; W. Luszczak; Y. Lyu; J. Madsen; E. Magnus; K. B. M. Mahn; Y. Makino; E. Manao; S. Mancina; W. Marie Sainte; I. C. Mariş; S. Marka; Z. Marka; M. Marsee; I. Martinez-Soler; R. Maruyama; F. Mayhew; T. McElroy; F. McNally; J. V. Mead; K. Meagher; S. Mechbal; A. Medina; M. Meier; Y. Merckx; L. Merten; J. Micallef; J. Mitchell; T. Montaruli; R. W. Moore; Y. Morii; R. Morse; M. Moulai; T. Mukherjee; R. Naab; R. Nagai; M. Nakos; U. Naumann; J. Necker; A. Negi; M. Neumann; H. Niederhausen; M. U. Nisa; A. Noell; A. Novikov; S. C. Nowicki; A. Obertacke Pollmann; V. O’Dell; B. Oeyen; A. Olivas; R. Orsoe; J. Osborn; E. O’Sullivan; H. Pandya; N. Park; G. K. Parker; E. N. Paudel; L. Paul; C. Pérez de los Heros; T. Pernice; J. Peterson; S. Philippen; A. Pizzuto; M. Plum; A. Pontén; Y. Popovych; M. Prado Rodriguez; B. Pries; R. Procter-Murphy; G. T. Przybylski; C. Raab; J. Rack-Helleis; K. Rawlins; Z. Rechav; A. Rehman; P. Reichherzer; E. Resconi; S. Reusch; W. Rhode; B. Riedel; A. Rifaie; E. J. Roberts; S. Robertson; S. Rodan; G. Roellinghoff; M. Rongen; A. Rosted; C. Rott; T. Ruhe; L. Ruohan; D. Ryckbosch; I. Safa; J. Saffer; D. Salazar-Gallegos; P. Sampathkumar; S. E. Sanchez Herrera; A. Sandrock; M. Santander; S. Sarkar; S. Sarkar; J. Savelberg; P. Savina; M. Schaufel; H. Schieler; S. Schindler; L. Schlickmann; B. Schlüter; F. Schlüter; N. Schmeisser; T. Schmidt; J. Schneider; F. G. Schröder; L. Schumacher; S. Sclafani; D. Seckel; M. Seikh; S. Seunarine; R. Shah; S. Shefali; N. Shimizu; M. Silva; B. Skrzypek; B. Smithers; R. Snihur; J. Soedingrekso; A. Søgaard; D. Soldin; P. Soldin; G. Sommani; C. Spannfellner; G. M. Spiczak; C. Spiering; M. Stamatikos; T. Stanev; T. Stezelberger; T. Stürwald; T. Stuttard; G. W. Sullivan; I. Taboada; S. Ter-Antonyan; A. Terliuk; M. Thiesmeyer; W. G. Thompson; J. Thwaites; S. Tilav; K. Tollefson; C. Tönnis; S. Toscano; D. Tosi; A. Trettin; C. F. Tung; R. Turcotte; J. P. Twagirayezu; M. A. Unland Elorrieta; A. K. Upadhyay; K. Upshaw; A. Vaidyanathan; N. Valtonen-Mattila; J. Vandenbroucke; N. van Eijndhoven; D. Vannerom; J. van Santen; J. Vara; J. Veitch-Michaelis; M. Venugopal; M. Vereecken; S. Verpoest; D. Veske; A. Vijai; C. Walck; Y. Wang; C. Weaver; P. Weigel; A. Weindl; J. Weldert; A. Y. Wen; C. Wendt; J. Werthebach; M. Weyrauch; N. Whitehorn; C. H. Wiebusch; D. R. Williams; L. Witthaus; A. Wolf; M. Wolf; G. Wrede; X. W. Xu; J. P. Yanez; E. Yildizci; S. Yoshida; R. Young; S. Yu; T. Yuan; Z. Zhang; P. Zhelnin; P. Zilberman; M. ZimmermanMon Mar 25 2024 20:00:00 (4 days)# 7.

Nature Physics, Published online: 26 March 2024; doi:10.1038/s41567-024-02436-wInteractions of atmospheric neutrinos with quantum-gravity-induced fluctuations of the metric of spacetime would lead to decoherence. The IceCube Collaboration constrains such interactions with atmospheric neutrinos.

from PRA – fundamentalconcepts by Gabriel H. S. Aguiar and George E. A. MatsasMon Mar 25 2024 06:00:00 (5 days)# 8.

Author(s): Gabriel H. S. Aguiar and George E. A. Matsas

Explaining the behavior of macroscopic objects from the point of view of the quantum paradigm has challenged the scientific community for the past century. A mechanism of gravitational self-interaction, governed by the so-called Schrödinger-Newton equation, is among the proposals that aim to shed so…

[Phys. Rev. A 109, 032223] Published Mon Mar 25, 2024

from philsciSun Mar 24 2024 01:38:19 (6 days)# 9.

]]>Riedel, Timotheus (2023) Relational Quantum Mechanics, quantum relativism, and the iteration of relativity. [Preprint]

In quantum mechanics, the zitterbewegung is a rapid oscillatory movement of quantum particle in single plane. It is a motion which can give idea about the sub structure of quantum particles. It is believed to be the reason for magnetic moment of the quantum particle. In 2023, a new toroidal model of proton has been proposed by Kovacs et al. In this article, a modification of the model has been proposed with the concept of ontic wave function and using the phenomenon of nuclear magnetic resonance. The analysis of zitterbewegung and the ontic wave function has shown that, using zitterbewegung and the concept of Larmor precession, a model for generation of radiant energy during nuclear magnetic resonance can be derived.

]]>In this paper I inquire into the applicability of topological structures in the mathematical modeling of certain quantum situations and attempt an interpretation, on the level of metatheory, of phenomena associated with the time evolution of quantum processes and the individuality of quantum objects upon observation. Accordingly the paper engages, on the one hand, in an epistemologically oriented discussion of the merits of topological approaches concerning natural science in general and certain questions of quantum theory in particular, and on the other, in an elaboration of a proper topological structure to deal with the mathematical aspects of an open question of the theory of quantum histories, the latter as developed mainly by C. J. Isham and co. On this motivation a brief discussion concerning the topological nature of the Bohm-Aharonov effect is thought to be in order. Overall the primary focus is to discuss the relevance of topology, as a pure mathematical theory of structures, with the quantum context and in particular of the quantum histories processes over temporal points and continuous time intervals.

]]>In this paper, we analyze the thought experiment of “Wigner’s friend” and point out that new understanding should be made to Born’s rule and measurement process: Born’s rule is no longer seen as a rule based on the history of the quantum system’s, and the measurement results are no longer directly related to the state of the measured object before the measurement. Inspired by Everett III and H. Zurek’s views, we believe that Born’s rule reflects the coordination between states of different parts in quantum entanglement systems, so it has nothing to do with the history of particles themselves but rather with the historical records. A new formulation of pilot wave theory, objective relative state formulation, or ORSF is suggested. Under this interpretation, micro-particles can also be assigned definite states before being observed. Based on this formulation, Wigner’s friend-like scenarios can be effectively explained. We also notice that our universe can be totally retrocausal by the new formulation. The new interpretation brings new perspectives to many quantum phenomena.

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