# Weekly Papers on Quantum Foundations (11)

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Sat Mar 11 2023 02:56:29 (7 hours)

# 1.

El Skaf, Rawad and Stuart, Michael T. (2023) Scientific Models and Thought Experiments: Same Same but Different. [Preprint]

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

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Marios Christodoulou, Andrea Di Biagio, Markus Aspelmeyer, Časlav Brukner, Carlo Rovelli, and Richard Howl

Fri Mar 10 2023 18:00:00 (16 hours)

# 2.

Author(s): Marios Christodoulou, Andrea Di Biagio, Markus Aspelmeyer, Časlav Brukner, Carlo Rovelli, and Richard Howl

The current interest in laboratory detection of entanglement mediated by gravity was sparked by an information-theoretic argument: entanglement mediated by a local field certifies that the field is not classical. Previous derivations of the effect modeled gravity as instantaneous; here we derive it …

[Phys. Rev. Lett. 130, 100202] Published Fri Mar 10, 2023

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R. P. Woodard (University of Florida)

Fri Mar 10 2023 09:53:28 (1 day)

# 3.

I share some reminiscences of the late Steven Weinberg. Then I discuss a topic in quantum field theory which he taught me: the role of state wave functionals in deriving the $i\epsilon$ term of the Feynman propagator when using the functional formalism. This is perhaps a curiosity for in-out scattering amplitudes on flat space backgrounds, but it is has much greater significance for the in-in amplitudes of the Schwinger-Keldysh formalism in cosmology. It also touches on the fate, about which Weinberg wondered, of the large logarithms one sometimes finds in quantum corrections from inflationary particle production.

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A.G.M. Pietrow

Fri Mar 10 2023 09:53:26 (1 day)

# 4.

In the later stages of his life, Christiaan Huygens semi-empirically derived a set of relations between the objective focus and diameter, the eyepiece focus, and the magnification that resulted from combining the two lenses. These relations were used by him and his brother to build what he believed were optimized telescopes. When comparing these equations to the ones derived from modern optical principles, Huygens’ telescopes were in fact far from optimal. While there are several potential reasons for this discrepancy, one possible reason, explored in this work, is that Huygens might have suffered from a mild case of myopia (or near-sightedness) and that he compensated for this condition by building telescopes that overmagnified by a factor of 3.5. Based on this hypothesis, Huygens’ visual acuity is estimated to be around 20/70, which on average corresponds to an optical prescription of -1.5 diopters

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Arundhati Dasgupta, José Fajardo-Montenegro

Fri Mar 10 2023 09:53:23 (1 day)

# 5.

With the discovery of gravitational waves, the search for the quantum of gravity, the graviton, is imminent. We discuss the current status of the bounds on graviton mass from experiments as well as the theoretical understanding of these particles. We provide an overview of current experiments in astrophysics such as the search for Hawking radiation in gamma-ray observations and neutrino detectors, which will also shed light on the existence of primordial black holes. Finally, the semiclassical corrections to the image of the event horizon are discussed.

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Alisson Tezzin

Fri Mar 10 2023 09:53:23 (1 day)

# 6.

Recently there has been much interest in deriving the quantum formalism and the set of quantum correlations from simple axioms. In this paper, we provide a step-by-step derivation of the quantum formalism that tackles both these problems and helps us to understand why this formalism is as it is. We begin with a structureless system that only includes real-valued observables, states and a (not specified) state update, and we gradually identify theory-independent conditions that make the algebraic structure of quantum mechanics be assimilated by it. In the first part of the paper, we derive essentially all the “commutative part” of the quantum formalism, i.e., all definitions and theorems that do not involve algebraic operations between incompatible observables, such as projections, Specker’s principle, and the spectral theorem; at the statistical level, the system is nondisturbing and satisfies the exclusivity principle at this stage. In the second part of the paper, we connect incompatible observables by taking transition probabilities between pure states into account. This connection is the final step needed to embed our system in a Hilbert space and to go from nondisturbing to quantum correlations.

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Philipp Roser, Matthew T. Scoggins

Fri Mar 10 2023 09:53:16 (1 day)

# 7.

The trajectories of the pilot-wave formulation of quantum mechanics and hence its empirical predictions may be recovered via the dynamics of a density function on the configuration space of a system, without reference to a physical wave function. We label such formulations CSD frameworks.’ But this result only holds if a particular, apparently ad hoc condition, broadly speaking equivalent to the single-valuedness of the wave function in standard quantum mechanics, is imposed. Here we relax this condition. We describe the types of scenarios in which this would lead to deviations from quantum mechanics. Using computational models we ask how the degree of non-quantumness’ of a state, suitably defined, changes with time. We find that it remains constant in time even under non-trivial dynamics, and argue that this implies that a dynamical justification of the Wallstrom condition is unlikely to be successful. However, we also make certain observations about stationary states in CSD frameworks, which may offer a way forward in justifying the Wallstrom condition.

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Fri Mar 10 2023 03:58:50 (1 day)

# 8.

Gao, Shan (2023) Many Worlds with both “And” and “Or”. [Preprint]

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Fri Mar 10 2023 03:58:19 (1 day)

# 9.

Allori, Valia (2023) Who’s Afraid of the Measurement Problem? On the Incompatibility between Scientific Realism and Quantum Mechanics. [Preprint]

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Nature Physics

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Yonglong Xie

Thu Mar 09 2023 08:00:00 (2 days)

# 10.

Nature Physics, Published online: 09 March 2023; doi:10.1038/s41567-023-01982-z

Local magnetometry measurements on a magnetic Chern insulator suggest that the Berry curvature of the topological band — responsible for the intrinsic magnetism — also enables ultra-low current switching of the magnetization.

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Thu Mar 09 2023 03:32:10 (2 days)

# 11.

Goyal, Philip (2023) Persistence and Reidentification in Systems of Identical Quantum Particles: Towards a Post-Atomistic Conception of Matter. [Preprint]

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Thu Mar 09 2023 03:30:03 (2 days)

# 12.

Penchev, Vasil (2022) Gentzen’s “cut rule” and quantum measurement in terms of Hilbert arithmetic. Metaphor and understanding modeled formally. [Preprint]

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Wed Mar 08 2023 04:05:12 (3 days)

# 13.

Gao, Shan (2023) Existence of macroscopic spatial superpositions in collapse theories. Studies In History and Philosophy of Science Part B: Studies In History and Philosophy of Modern Physics, 86. pp. 1-5. ISSN 13552198

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Wed Mar 08 2023 04:04:35 (3 days)

# 14.

Gao, Shan (2023) Does quantum cognition imply quantum minds? Journal of Consciousness Studies, 28 (3-4). pp. 100-111.

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Wed Mar 08 2023 04:03:56 (3 days)

# 15.

Gao, Shan (2023) A no-go result for QBism. Foundations of Physics, 51 (103). ISSN 1572-9516

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Wed Mar 08 2023 04:03:20 (3 days)

# 16.

Gao, Shan (2023) Understanding Time Reversal in Quantum Mechanics: A New Derivation. Foundations of Physics, 52 (114). ISSN 1572-9516

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Wed Mar 08 2023 04:02:44 (3 days)

# 17.

Gao, Shan (2023) Can pragmatist quantum realism explain protective measurements? Foundations of Physics, 53 (11). ISSN 0015-9018

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Wed Mar 08 2023 04:02:11 (3 days)

# 18.

Allori, Valia (2023) Many-Worlds: Why Is It Not the Consensus? [Preprint]

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Wed Mar 08 2023 04:01:01 (3 days)

# 19.

Allori, Valia (2023) What if We Lived in the Best of All Possible (Quantum) Worlds? [Preprint]

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Mojtaba Shahbazi

Mon Mar 06 2023 09:51:49 (5 days)

# 20.

Empirical confirmation in some areas of physics is obscure; for example in Hawking radiation. However, the analogue gravity can simulate these phenomena in condensed matter systems. That is an important question whether the observation of these phenomena in the condensed matter systems can be confirmatory of the original phenomenon or not. In this work we answer affirmatively to this question via structuralism.

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