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PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Sat Dec 03 2022 03:22:21 (7 hours)

# 1.

Kimpton-Nye, Samuel (2022) Laws of Nature: Necessary and Contingent. The Philosophical Quarterly, 72 (4). pp. 875-895.

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PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Sat Dec 03 2022 03:21:35 (7 hours)

# 2.

Kimpton-Nye, Samuel (2022) How to be a powers theorist about functional laws, conservation laws and symmetries. Philosophical Studies. ISSN 0031-8116

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Johanna Erdmenger, Marius Gerbershagen, Michal P. Heller, Anna-Lena Weigel

Fri Dec 02 2022 10:03:46 (1 day)

# 3.

An important conjecture within the AdS/CFT correspondence relates holographic spacetime to the quantum computational complexity of the dual quantum field theory. However, the quantitative understanding of this relation is still an open question. In this work, we introduce and study a map between a computational complexity measure and its holographic counterpart from first principles. We consider quantum circuits built out of conformal transformations in two-dimensional conformal field theory and a complexity measure based on assigning a cost to quantum gates via the Fubini-Study distance. We find a novel geometric object in three-dimensional anti-de Sitter spacetimes that is dual to this distance. This duality also provides a more general map between holographic geometry of anti-de Sitter universes and complexity geometry as defined in information theory, in which each point represents a state and distances between states are measured by the Fubini-Study metric. We apply the newly found duality to the eternal black hole spacetime and discuss both the origin of linear growth of complexity and the switchback effect within our approach.

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Isaac H. Kim, John Preskill

Fri Dec 02 2022 10:03:38 (1 day)

# 4.

Recently, Akers et al. proposed a non-isometric holographic map from the interior of a black hole to its exterior. Within this model, we study properties of the black hole $S$-matrix, which are in principle accessible to observers who stay outside the black hole. Specifically, we investigate a scenario in which an infalling agent interacts with radiation both outside and inside the black hole. Because the holographic map involves postselection, the unitarity of the $S$-matrix is not guaranteed in this scenario, but we find that unitarity is satisfied to very high precision if suitable conditions are met. If the internal black hole dynamics is described by a pseudorandom unitary transformation, and if the operations performed by the infaller have computational complexity scaling polynomially with the black hole entropy, then the $S$-matrix is unitary up to corrections that are superpolynomially small in the black hole entropy. Furthermore, while in principle quantum computation assisted by postselection can be very powerful, we find under similar assumptions that the $S$-matrix of an evaporating black hole has polynomial computational complexity.

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Moslem Shafiee, Yousef Bahrampour

Fri Dec 02 2022 10:03:34 (1 day)

# 5.

We study the backreaction of quantum fields induced through the vacuum polarization and the conformal anomaly on the collapse of a thin shell of dust. It is shown that the final fate of the collapse process depends on the physical properties of the shell, including its rest and gravitational masses. Investigating the conditions for the formation of black holes, we notice that quantum effects modify the geometry and structure of Schwarzschild space-time in such a way that black holes have two horizons, an inner and an outer horizon. If the gravitational mass of the shell is about that of an ordinary star, then in most cases, the semi-classical collapse will terminate in a singularity, and in general, quantum fluctuations are not strong enough to prevent the creation of the singularity. Although under certain conditions, it is possible to form a non-singular black hole, i.e., a regular black hole. In this way, the collapse stops at a radius much larger than the Planck length below the inner horizon, and the shell bounces and starts an expansion.

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Kuan-Nan Lin, Pisin Chen

Fri Dec 02 2022 10:03:30 (1 day)

# 6.

Analog Hawking radiation emitted by a perfectly reflecting mirror in (1+3)-dimensional flat spacetime is investigated. This is accomplished by studying the reflected frequency and momentum based on Einstein mirror, instead of the canonical way of solving, if possible, wave equations subjected to a dynamical Dirichlet boundary condition. In the case of a finite-size mirror, diffraction pattern appears in the radiation spectrum. Based on the relevant parameters in the proposed AnaBHEL experiment, where the Hawking temperature TH = 0.03 eV and the mirror area A = 0.1 mm2, the Hawking photon yield is estimated to be N = 16 per laser shot (assuming a high reflectivity mirror can be generated in the proposed AnaBHEL experiment).

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PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Fri Dec 02 2022 04:17:02 (1 day)

# 7.

Vos, Bobby (2022) Structuralism and the Quest for Lost Reality. Journal for General Philosophy of Science. ISSN 0925-4560

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physics.hist-ph updates on arXiv.org

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Galina L. Klimchitskaya, Vladimir M. Mostepanenko

Thu Dec 01 2022 10:23:24 (2 days)

# 8.

We review the main scientific pictures of the universe developed from ancient times to Albert Einstein and underline that all of them treated the universe as a stationary system with unchanged physical properties. In contrast to this, 100 years ago Alexander Friedmann predicted that the universe expands starting from the point of infinitely large energy density. We briefly discuss the physical meaning of this prediction and its experimental confirmation consisting of the discovery of redshift in the spectra of remote galaxies and relic radiation. After mentioning the horizon problem in the theory of the hot universe, the inflationary model is considered in connection with the concept of quantum vacuum as an alternative to the inflaton field. The accelerated expansion of the universe is discussed as powered by the cosmological constant originating from the quantum vacuum. The conclusion is made that since Alexander Friedmann’s prediction of the universe expansion radically altered our picture of the world in comparison with the previous epochs, his name should be put on a par with the names of Ptolemy and Copernicus.

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Andrew G. White

Thu Dec 01 2022 08:00:00 (2 days)

# 9.

Nature Physics, Published online: 01 December 2022; doi:10.1038/s41567-022-01860-0

A clever experiment with a photonic circuit has realized three-dimensional non-Abelian quantum behaviour — introducing an experimental testbed for field and gauge theories.

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PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Wed Nov 30 2022 02:32:40 (3 days)

# 10.

Gao, Shan (2022) Locality Implies Reality of the Wave Function: Hardy’s Theorem Revisited. [Preprint]

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PRL: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Robert I. Booth, Ulysse Chabaud, and Pierre-Emmanuel Emeriau

Tue Nov 29 2022 18:00:00 (3 days)

# 11.

Author(s): Robert I. Booth, Ulysse Chabaud, and Pierre-Emmanuel Emeriau

Quantum computers promise considerable speedups with respect to their classical counterparts. However, the identification of the innately quantum features that enable these speedups is challenging. In the continuous-variable setting—a promising paradigm for the realization of universal, scalable, an…

[Phys. Rev. Lett. 129, 230401] Published Tue Nov 29, 2022

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physics.hist-ph updates on arXiv.org

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Siddharth Muthukrishnan

Tue Nov 29 2022 10:22:04 (4 days)

# 12.

“Black hole complementarity” is a label attached to an influential set of ideas that have emerged in response to the black hole information paradoxes. However, many different claims come under that label in the literature, and it can often be confusing what an appeal to “black hole complementarity” is meant to do. Unpacking this literature, I argue that black hole complementarity is about the consistency of quantum characterizations of an evaporating black hole. To bring this into focus, I delineate two consistency claims — i.e., two principles of black hole complementarity: operational complementarity and descriptive complementarity. These two principles are more or less attractive depending on one’s background philosophy of science. Instrumentalists will lean towards operational complementarity while scientific realists will lean towards descriptive complementarity. If one resists instrumentalism (as many do, for good reason), one has a prima facie reason to adopt the descriptive principle and reject the operational principle. However, a series of thought experiments in the physics literature on black hole complementarity gives us strong reasons to adopt the operational principle and reject the descriptive principle. This shows that if we can stomach instrumentalism, then operational complementarity may suffice to resolve the black hole information paradox.

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physics.hist-ph updates on arXiv.org

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Carlo Rovelli, Francesca Vidotto

Tue Nov 29 2022 10:22:03 (4 days)

# 13.

Understanding the quantum aspects of gravity is not only a matter of equations and experiments. Gravity is intimately connected with the structure of space and time, and understanding quantum gravity requires us to find a conceptual structure appropriate to make sense of the quantum aspects of space and time. In the course of the last decades, an extensive discussion on this problem has led to a clear conceptual picture, that provides a coherent conceptual foundation of today’s Loop Quantum Gravity. We review this foundation, addressing issues such as the sense in which space and time are emergent, the notion of locality, the role of truncation that enables physical computations on finite graphs, the problem of time, and the characterization of the observable quantities in quantum gravity.

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PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Tue Nov 29 2022 09:03:47 (4 days)

# 14.

Merritt, David (2020) A Philosophical Approach to MOND: Assessing the Milgromian Research Program in Cosmology. pp. 1-270.

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Mon Nov 28 2022 16:33:18 (4 days)

# 15.

Roberts, Bryan W. (2022) Reversing the Arrow of Time. Cambridge University Press, Cambridge. ISBN 978-1-009-12332-7

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PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Sun Nov 27 2022 12:04:19 (5 days)

# 16.

Schupbach, Jonah N. (2022) On the Logical Structure of Best Explanations. In: UNSPECIFIED.