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physics.hist-ph updates on arXiv.org
by
Aurélien Drezet
Fri May 12 2023 08:56:19 (4 days)
# 1.
We assess the analysis made by Bohr in 1935 of the Einstein Podolsky Rosen paradox/theorem. We explicitly describe Bohr’s gedanken experiment involving a double-slit moving diaphragm interacting with two independent particles and show that the analysis provided by Bohr was flawed. We propose a different protocol correcting Bohr’s version that confirms EPR dilemma: Quantum mechanics is either incomplete or non-local.
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Pranay Patil, Ayushi Singhania, Jad C. Halimeh
Fri May 12 2023 08:56:18 (4 days)
# 2.
Hilbert space fragmentation is an intriguing paradigm of ergodicity breaking in interacting quantum many-body systems with applications to quantum information technology, but it is usually adversely compromised in the presence of perturbations. In this work, we demonstrate the protection of constrained dynamics arising due to a combination of mirror symmetry and Hilbert space fragmentation by employing the concept of quantum Zeno dynamics. We focus on an Ising spin ladder with carefully chosen quantum fluctuations, which in the ideal case guarantee a perfect disentanglement under Hamiltonian dynamics for a large class of initial conditions. This is known to be a consequence of the interplay of Hilbert space fragmentation with a mirror symmetry, and we show numerically the effect of breaking the latter. To evince the power of this perfect disentanglement, we study the effect of generic perturbations around the fine-tuned model, and show that we can protect against the undesirable growth of entanglement entropy by using a local Ising interaction on the rungs of the ladder. This allows us to suppress the entanglement entropy to an \textit{arbitrarily} small value for an \textit{arbitrarily} long time by controlling the strength of the rung interaction. Our work demonstrates the experimentally feasible viability of quantum Zeno dynamics in the protection of quantum information against thermalization.
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Neil Lu, Susan M. Scott, Karl Wette
Fri May 12 2023 08:56:15 (4 days)
# 3.
Neutron stars are one of the most mysterious wonders in the Universe. Their extreme densities hint at new and exotic physics at work within. Gravitational waves could be the key to unlocking their secrets. In particular, a first detection of gravitational waves from rapidly-spinning, deformed neutron stars could yield new insights into the physics of matter at extreme densities and under strong gravity. Once a first detection is made, a critical challenge will be to robustly extract physically interesting information from the detected signals. In this essay, we describe initial research towards answering this challenge, and thereby unleashing the full power of gravitational waves as an engine for the discovery of new physics.
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Savannah Garmon
Fri May 12 2023 08:00:00 (4 days)
# 4.
Nature Physics, Published online: 12 May 2023; doi:10.1038/s41567-023-02055-x
Imposing PT-symmetry and pseudo-Hermitian symmetry on an electric circuit with non-reciprocal couplings results in a complex morphology of degenerate eigenvalues that might yield new possibilities in sensing and dynamical engineering.
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Fri May 12 2023 01:04:07 (4 days)
# 5.
Weinstein, Galina (2021) Do gravitational waves confirm Hawking’s area law? [Preprint]
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Fri May 12 2023 01:03:26 (4 days)
# 6.
Lewis, Peter J. and Fallis, Don and Fitelson, Branden (2022) Accuracy-first epistemology and scientific progress. In: UNSPECIFIED.
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Fri May 12 2023 01:02:26 (4 days)
# 7.
Weinstein, Galina (2022) Maxwell’s demon and impossibility statements: Einstein on perpetuum mobile of the second kind. [Preprint]
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Fri May 12 2023 01:01:30 (4 days)
# 8.
Weinstein, Galina (2021) Demons in Black Hole Thermodynamics: Bekenstein and Hawking. [Preprint]
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Thu May 11 2023 00:36:46 (5 days)
# 9.
Freeborn, David Peter Wallis and Gilton, Marian and Mitsch, Chris (2023) Haag as a How-To Theorem. [Preprint]
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Wed May 10 2023 00:47:26 (6 days)
# 10.
Christian, Joy (2023) Bell’s Theorem Begs the Question. [Preprint]
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Wed May 10 2023 00:46:53 (6 days)
# 11.
Gao, Shan (2023) Does Bohmian mechanics solve the measurement problem? Maybe not yet. [Preprint]
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Tue May 09 2023 00:53:56 (1 week)
# 12.
Yasmineh, Salim (2022) Foundations of Quantum Mechanics. Foundations of Quantum Mechanics.
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Tue May 09 2023 00:53:12 (1 week)
# 13.
Babic, Joshua and Cocco, Lorenzo (2023) Mandersian Relationism: Space, Modality and Equivalence. Philosophy of Science. ISSN 1539-767X
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physics.hist-ph updates on arXiv.org
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Aurélien Drezet
Mon May 08 2023 17:25:43 (1 week)
# 14.
In this chapter we discuss the Einstein Podolsky Rosen theorem and its strong relation with Bell’s theorem. We clarify some ambiguities concerning `local-realism’ and emphasize that neither realism nor determinism nor counterfactual definiteness are prerequisite of these theorems.
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Charles T. Sebens
Mon May 08 2023 17:25:42 (1 week)
# 15.
Problems of self-interaction arise in both classical and quantum field theories. To understand how such problems are to be addressed in a quantum theory of the Dirac and electromagnetic fields (quantum electrodynamics), we can start by analyzing a classical theory of these fields. In such a classical field theory, the electron has a spread-out distribution of charge that avoids some of the problems of self-interaction facing point charge models. However, there remains the problem that the electron will experience self-repulsion. This self-repulsion cannot be eliminated within classical field theory without also losing Coulomb interactions between distinct particles. But, electron self-repulsion can be eliminated from quantum electrodynamics in the Coulomb gauge by fully normal-ordering the Coulomb term in the Hamiltonian. After normal-ordering, the Coulomb term contains pieces describing attraction and repulsion between distinct particles and also pieces describing particle creation and annihilation, but no pieces describing self-repulsion.
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Mon May 08 2023 06:54:44 (1 week)
# 16.
Jalloh, Mahmoud (2023) The Π-Theorem as a Guide to Quantity Symmetries and the Argument Against Absolutism. [Preprint]
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Sun May 07 2023 00:22:44 (1 week)
# 17.
Shkliarevsky, Gennady (2023) THE EMPEROR WITH NO CLOTHES: Chomsky Against ChatGPT. [Preprint]
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Sun May 07 2023 00:20:45 (1 week)
# 18.
Wu, Jingyi and Weatherall, James Owen (2023) Between a Stone and a Hausdorff Space. [Preprint]
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Galina Weinstein
Wed May 03 2023 14:52:41 (1 week)
# 19.
In 2003, Simon Baron-Cohen, a world expert on autism, diagnosed Einstein posthumously with Asperger’s syndrome. I think we cannot diagnose a dead person. Historians of science have fiercely objected to this trend of diagnosing deceased scientists by reconstructing from scant evidence, calling these diagnoses myths. Despite the historians’ efforts at demolishing myths, Einstein has been constantly diagnosed with Asperger’s syndrome. I will stick my neck out and suggest in this paper that although historians’ critique of Baron-Cohen and others includes debunking myths, it piggybacks on another myth that uses the following metaphors: a dull and socially adept Einstein who worked at Zurich, Prague, Berlin, and Princeton, an industrious scientist who earned his living through his work as a professor at the university; he had a special gift of friendship and collegiality, and he was deeply embedded in the academic community. These explanations do not make sense from the perspective of Einstein sitting in his office at Princeton, let alone Einstein sitting in the patent office. This perhaps explains the tendency of people to find counterclaims and myths more persuasive than historians’ explanations which seem deeply problematic.
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physics.hist-ph updates on arXiv.org
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Jobst Landgrebe, Barry Smith
Wed May 03 2023 14:52:39 (1 week)
# 20.
The view of nature we adopt in the natural attitude is determined by common sense, without which we could not survive. Classical physics is modelled on this common-sense view of nature, and uses mathematics to formalise our natural understanding of the causes and effects we observe in time and space when we select subsystems of nature for modelling. But in modern physics, we do not go beyond the realm of common sense by augmenting our knowledge of what is going on in nature. Rather, we have measurements that we do not understand, so we know nothing about the ontology of what we measure. We help ourselves by using entities from mathematics, which we fully understand ontologically. But we have no ontology of the reality of modern physics; we have only what we can assert mathematically. In this paper, we describe the ontology of classical and modern physics against this background and show how it relates to the ontology of common sense and of mathematics.
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Jose Manuel Rodriguez Caballero
Wed May 03 2023 14:52:38 (1 week)
# 21.
In this essay, we explore the geometric structures involved in the Wolfram model of fundamental physics. Furthermore, we propose some directions of research aiming to get the bosons and fermions out of this framework.
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Michael E. Cuffaro, Stephan Hartmann
Tue May 02 2023 18:47:02 (1 week)
# 22.
It is argued that those who defend the Everett, or `Many Worlds’, interpretation of quantum mechanics should embrace what we call the general quantum theory of open systems (GT) as the proper framework in which to conduct foundational and philosophical investigation in quantum physics. GT is a wider dynamical framework than its alternative, standard quantum theory (ST). This is true even though GT makes no modifications to the quantum formalism. GT rather takes a different view, what we call the open systems view, of the formalism; i.e., in GT the dynamics of systems, whose physical states are fundamentally represented by density operators, are represented as fundamentally open as specified by an in general non-unitary dynamical map. This includes, in principle, the dynamics of the universe as a whole. We argue that the more general dynamics describable in GT can be physically motivated, that there is as much prima facie empirical support for GT as there is for ST, and that GT could be fully in the spirit of the Everett interpretation — that there might, in short, be little reason for an Everettian not to embrace the more general theoretical landscape that GT allows one to explore.
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Sat Apr 29 2023 00:55:58 (2 weeks)
# 23.
Gomes, Henrique and ROVELLI, Carlo (2023) On the analogies between gravitational and electromagnetic radiative energy. [Preprint]
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Sat Apr 29 2023 00:54:04 (2 weeks)
# 24.
Muller, F.A. (2023) Six Measurement Problems of Quantum Mechanics. [Preprint]
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Thu Apr 27 2023 00:57:53 (2 weeks)
# 25.
Gao, Shan (2023) Can the universe be in a mixed state? or did God have a choice in creating the universe? [Preprint]
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Thu Apr 27 2023 00:57:13 (2 weeks)
# 26.
Penchev, Vasil (2023) Hilbert mathematics versus Gödel mathematics III. Hilbert mathematics by itself, and Gödel mathematics versus the physical world within it: both as its particular cases. [Preprint]
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Paolo Molaro
Wed Apr 26 2023 08:57:29 (2 weeks)
# 27.
An intriguing reference to the existence of a self-portrait by Galileo Galilei is contained in the biography of the scientist by Thomas Salusbury dated ca. 1665, of which only one incomplete and inaccessible copy exists. Galileo grew up in a Renaissance atmosphere, acquiring an artistic touch. He was a musician, a writer and also a painter, as reported by Viviani and documented by his watercolours of the Moon and drawings of solar spots. Recently a new portrait with a remarkable similarity to the portraits of Galileo Galilei by Santi di Tito (1601), Domenico Tintoretto (ca. 1604), and Furini (ca. 1612) has been found and examined using sophisticated face recognition techniques. If the identity could be confirmed, other elements, such as the young age of Galileo or the seam in the canvas revealed by infrared and X-ray analysis, may suggest a possible link with the self-portrait mentioned by Salusbury.
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Soumya Chakrabarti
Wed Apr 26 2023 08:57:16 (2 weeks)
# 28.
We show that it is possible to steer clear of a spacetime singularity during gravitational collapse by considering the time-variation of a fundamental coupling, in this case, the fine structure constant {\alpha}. We study a spherical distribution of cold dark matter coexisting with other fluid elements, collapsing under its own gravity. Dark matter is written as a scalar field interacting with electrically charged matter. This leads to a time variation of {\alpha} and as a consequence, a breakdown of local charge conservation within the sphere. The exterior has no such field and therefore, Einstein’s GR and standard equivalence principles remain valid. We derive the lowest possible bound on the collapse of this sphere beyond which there is a bounce and dispersal of most of the accumulated matter. We discuss the critical behavior of the system around this point and show that the bound is connected to a length scale of the order of Planck, introduced in theory for dimensional requirements.
