Weekly Papers on Quantum Foundations (42)

The process theory of causality: an overview 

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

Sat Oct 15 2022 01:23:56 (6 hours)

# 1.

Otsuka, Jun and Saigo, Hayato (2022) The process theory of causality: an overview. [Preprint]

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Berry Phase from the Entanglement of Future and Past Light Cones: Detecting the Timelike Unruh Effect 

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

 by 

James Q. Quach, Timothy C. Ralph, and William J. Munro

Fri Oct 14 2022 18:00:00 (14 hours)

# 2.

Author(s): James Q. Quach, Timothy C. Ralph, and William J. Munro

The Unruh effect can not only arise out of the entanglement between modes of left and right Rindler wedges, but also between modes of future and past light cones. We explore the geometric phase resulting from this timelike entanglement between the future and past, showing that it can be captured in …

[Phys. Rev. Lett. 129, 160401] Published Fri Oct 14, 2022

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Is the Observable Universe Consistent with the Cosmological Principle?. (arXiv:2207.05765v3 [astro-ph.CO] UPDATED) 

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physics.hist-ph updates on arXiv.org

 by 

Pavan Kumar Aluri, Paolo Cea, Pravabati Chingangbam, Ming-Chung Chu, Roger G. Clowes, Damien Hutsemékers, Joby P. Kochappan, Andrzej Krasiński, Alexia M. Lopez, Lang Liu, Niels C. M. Martens, C. J. A. P. Martins, Konstantinos Migkas, Eoin Ó Colgáin, Pratyush Pranav, Lior Shamir, Ashok K. Singal, M. M. Sheikh-Jabbari, Jenny Wagner, Shao-Jiang Wang, David L. Wiltshire, Shek Yeung, Lu Yin, Wen Zhao

Fri Oct 14 2022 09:06:55 (23 hours)

# 3.

The Cosmological Principle (CP) — the notion that the Universe is spatially isotropic and homogeneous on large scales — underlies a century of progress in cosmology. It is formulated through the Friedmann-Lema\^itre-Robertson-Walker (FLRW) cosmologies as the spacetime metric, and culminates in the successful and highly predictive $\Lambda$-Cold-Dark-Matter ($\Lambda$CDM) model. Yet, tensions have emerged within the $\Lambda$CDM model, most notably a statistically significant discrepancy in the value of the Hubble constant, $H_0$. Since the notion of cosmic expansion determined by a single parameter is intimately tied to the CP, implications of the $H_0$ tension may extend beyond $\Lambda$CDM to the CP itself. This review surveys current observational hints for deviations from the expectations of the CP, highlighting synergies and disagreements that warrant further study. Setting aside the debate about individual large structures, potential deviations from the CP include variations of cosmological parameters on the sky, discrepancies in the cosmic dipoles, and mysterious alignments in quasar polarizations and galaxy spins. While it is possible that a host of observational systematics are impacting results, it is equally plausible that precision cosmology may have outgrown the FLRW paradigm, an extremely pragmatic but non-fundamental symmetry assumption.

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Modified gravity approaches to the cosmological constant problem. (arXiv:2210.06810v1 [gr-qc]) 

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gr-qc updates on arXiv.org

 by 

The FADE Collaboration: Heliudson Bernardo, Benjamin Bose, Guilherme Franzmann, Steffen Hagstotz, Yutong He, Aliki Litsa, Florian Niedermann

Fri Oct 14 2022 09:06:45 (23 hours)

# 4.

The cosmological constant and its phenomenology remain among the greatest puzzles in theoretical physics. We review how modifications of Einstein’s general relativity could alleviate the different problems associated with it that result from the interplay of classical gravity and quantum field theory. We introduce a modern and concise language to describe the problems associated with its phenomenology, and inspect no-go theorems and their loopholes to motivate the approaches discussed here. Constrained gravity approaches exploit minimal departures from general relativity; massive gravity introduces mass to the graviton; Horndeski theories lead to the breaking of translational invariance of the vacuum; and models with extra dimensions change the symmetries of the vacuum. We also review screening mechanisms that have to be present in some of these theories if they aim to recover the success of general relativity on small scales as well. Finally, we summarise the statuses of these models in their attempt to solve the different cosmological constant problems while being able to account for current astrophysical and cosmological observations.

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Approaches To Quantum Cosmology: A Review. (arXiv:2210.06981v1 [gr-qc]) 

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gr-qc updates on arXiv.org

 by 

Raymond Isichei

Fri Oct 14 2022 09:06:41 (23 hours)

# 5.

A review of the path integral approach to quantum cosmology and its relation to canonical quantisation. The initial derivation of the Hartle-Hawking and Vilenkin wavefunctions from the Euclidean Einstein-Hilbert action, and later, from the Lorentzian path integral using Picard-Lefshets Theory is discussed. Path integral quantisation of the Einstein-Cartan action is then employed to obtain the wavefunctions for minisuperspace closed FRW universes dominated by matter and radiation. These calculations are complimentary to those recently carried out by Magueijo using canonical quantisation of the same action.

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The Multiverse Pandemic. (arXiv:2210.05377v1 [physics.hist-ph]) 

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physics.hist-ph updates on arXiv.org

 by 

Nicolas Gisin

Wed Oct 12 2022 09:57:05 (2 days)

# 6.

I argue against the many-world interpretation (MWI) of quantum theory by emphasizing that when everything is entangled with everything else, in one big monstrous piece, there is no room left for creativity. Since the MWI was invented, it proves itself wrong (appeared first in French in [N. Gisin, L’\’epid\’emie du multivers, in Le plus grand des hasards, p. 184, eds J.F. Dars et A. Papillault, Belin 2010]).

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The Pseudoscience of Time Travel. (arXiv:2210.05386v1 [physics.hist-ph]) 

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physics.hist-ph updates on arXiv.org

 by 

Andrew Knight

Wed Oct 12 2022 09:57:04 (2 days)

# 7.

Because closed timelike curves are consistent with general relativity, many have asserted that time travel into the past is physically possible if not technologically infeasible. However, the possibility of time travel into the past rests on the unstated and false assumption that zero change to the past implies zero change to the present. I show that this assumption is logically inconsistent; as such, it renders time travel into the past both unscientific and pseudoscientific.

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Some multifaceted aspects of mathematical physics, our common denominator with Elliott Lieb. (arXiv:2204.02160v3 [math.HO] UPDATED) 

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physics.hist-ph updates on arXiv.org

 by 

Daniel Sternheimer

Tue Oct 11 2022 10:07:32 (3 days)

# 8.

Mathematical physics has many facets, of which we shall briefly give a (very partial) description, centered around those of main interest for Elliott and us (Moshe Flato and I). In our case these aspects had as a corollary a variety of “parascientific activities”, in particular the foundation of IAMP (the International Association of Mathematical Physics) and of the journal LMP (Letters in Mathematical Physics), both of which were strongly impacted by Elliott, and Elliott’s long insistence that publishers do not demand “copyright transfer” as a precondition for publication but are satisfied with “consent to publish”, which is increasingly becoming standard. Since this article is testimony to the huge scientific impact of Elliott, the latter intertwined aspects constitute the core of the present contribution. The last part deals briefly with metaphysical and metamathematical considerations related to axioms.

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On the influence of gravity on the propagation of light, with some comments on the A. Einstein`s 1911 Paper (1911-2022), Light Interaction With Gravity (The Mistake Made In 1911). (arXiv:2208.11680v5 [physics.hist-ph] UPDATED) 

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physics.hist-ph updates on arXiv.org

 by 

Rigoberto Martinez

Tue Oct 11 2022 10:07:31 (3 days)

# 9.

This is a review with some comments on the A. Einstein`s 1911 paper, which he published as one of his many attempts of the general theory of relativity. The main point of the idea is to propose a new approach about light and its motion as well as study the assumption made by A. Einstein concerning the possibility of the variation of the speed of light in presence of gravitational field.

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A Mechanistic Guide to Reductive Physicalism 

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

Tue Oct 11 2022 05:42:32 (4 days)

# 10.

Baetu, Tudor (2022) A Mechanistic Guide to Reductive Physicalism. [Preprint]

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Counting 3d-spaces: classicality and probability in standard and many-worlds quantum mechanics from quantum-gravitational background-freedom 

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

Tue Oct 11 2022 01:21:33 (4 days)

# 11.

Stoica, Ovidiu Cristinel (2022) Counting 3d-spaces: classicality and probability in standard and many-worlds quantum mechanics from quantum-gravitational background-freedom. [Preprint]

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