# Weekly Papers on Quantum Foundations (1)

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

Fri Dec 30 2022 21:22:11 (12 hours)

# 1.

Burock, Marc (2022) Sleeping Beauty Remains Undecided. [Preprint]

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Fri Dec 30 2022 21:20:37 (12 hours)

# 2.

Koberinski, Adam (2022) What good is Haag’s no-go theorem? What axiomatic methods can teach us about particle physics. In: UNSPECIFIED.

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Fri Dec 30 2022 21:16:29 (12 hours)

# 3.

Oriti, Daniele (2022) Tightrope-walking rationality in action: Feyerabendian insights for the foundations of quantum mechanics. [Preprint]

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T. Rick Perche, Eduardo Martín-Martínez

Thu Dec 29 2022 12:16:05 (1 day)

# 4.

We analyze the differences between relativistic fields with or without quantum degrees of freedom in relativistic quantum information protocols. We classify the regimes where the existence of quantum degrees of freedom is necessary to explain the phenomenology of interacting quantum systems. We also identify the precise regimes where quantum fields can be well approximated by quantum-controlled classical fields in relativistic quantum information protocols. Our results can be useful to discern which features are fundamentally different in classical and quantum field theory.

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Samuel Leutheusser, Hong Liu

Thu Dec 29 2022 12:16:04 (1 day)

# 5.

In holographic duality, a higher dimensional quantum gravity system emerges from a lower dimensional conformal field theory (CFT) with a large number of degrees of freedom. We propose a formulation of duality for a general causally complete bulk spacetime region, called subalgebra-subregion duality, which provides a framework to describe how geometric notions in the gravity system, such as spacetime subregions, different notions of times, and causal structure, emerge from the dual CFT. Subalgebra-subregion duality generalizes and brings new insights into subregion-subregion duality (or equivalently entanglement wedge reconstruction). It provides a mathematically precise definition of subregion-subregion duality and gives an independent definition of entanglement wedges without using entropy. Geometric properties of entanglement wedges, including those that play a crucial role in interpreting the bulk as a quantum error correcting code, can be understood from the duality as the geometrization of the additivity anomaly of certain algebras. Using general boundary subalgebras rather than those associated with geometric subregions makes it possible to find duals for general bulk spacetime regions, including those not touching the boundary. Applying subalgebra-subregion duality to a boundary state describing a single-sided black hole also provides a precise way to define mirror operators.

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Jakub M. Ratajczak

Thu Dec 29 2022 12:16:02 (1 day)

# 6.

Quantum mechanics has lacked a widely recognized interpretation since its birth. Many of these are still under consideration because interpretations are tough or impossible to disprove experimentally. We show how to distinguish experimentally ones assuming tiny, localized particles from those postulating realistic, non-local wave functions. It is possible thanks to a recently developed model of optical transmittance of ultra-diluted gas. This model considers the influence of each gas particle wave function on transmitted light. Its quantitative predictions are not indifferent to the interpretation of quantum mechanics. We also refer to the results of a recent experiment founded on this theory. They are in line with the predictions, which suggests the correctness of the model. Such results, if confirmed, rule out interpretations of the type of pilot-wave. In the paper, we briefly explain both the experiment and the model it is founded on. We also discuss the meaning of the Born rule.

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Ngo Phuc Duc Loc

Thu Dec 29 2022 12:16:00 (1 day)

# 7.

We know that space and time are treated almost equally in classical physics, but we also know that this is not the case for quantum mechanics. A quantum description of both space and time is important to really understand the quantum nature of reality. The Page-Wootters mechanism of quantum time is a promising starting point, according to which the evolution of the quantum system is described by the entanglement between it and quantum temporal degrees of freedom. In this paper, we use a qubit clock model to study how the time-system entanglement measures depend on the rapidity when the quantum system is Lorentz boosted. We consider the case of a spin-1/2 particle with Gaussian momentum distribution as a concrete example.

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Shurui Wu, Bing-Qian Wang, Z. W. Long, Hao Chen

Thu Dec 29 2022 12:15:53 (1 day)

# 8.

Recently, Elias C. Vagenas et al and Yongwan Gim et al studied the validity of the no-cloning theorem in the context of generalized uncertainty principle (GUP), but they came to conflicting conclusions. Motivated by a recent work presented by Xin-Dong Du, we investigate the corrections to the temperature for Schwarzschild black hole in the context of different forms of GUP, and obtain the required energy to duplicate information for the Schwarzschild black hole, it shows that the no-cloning theorem in the present of GUP is safe.

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J. Fernando Barbero G., Daniele Pranzetti

Thu Dec 29 2022 12:15:52 (1 day)

# 9.

We give an account of the state of the art about black hole entropy in Loop Quantum Gravity. This chapter contains a historical summary and explains how black hole entropy is described by relying on the concept of isolated horizon, with an emphasis on different representations of its associated symmetry group. It continues with a review of the combinatorial methods necessary to understand the behavior of the entropy as a function of the area and concludes with a discussion of the nature of the quantum horizon degrees of freedom that account for the black hole entropy and the related issue of the fixing of the Immirzi parameter.

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Wed Dec 28 2022 07:30:45 (3 days)

# 10.

Price, Huw and Wharton, Ken (2022) Why entanglement? [Preprint]

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

Wed Dec 28 2022 07:29:35 (3 days)

# 11.

Sagrafena, Cristina (2022) The Old Evidence Problem and the Inference to the Best Explanation. [Preprint]

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Gerald A. Goldin

Tue Dec 27 2022 10:26:50 (3 days)

# 12.

Prediction of “anyons”, often attributed exclusively to Wilczek, came first from Leinaas & Myrheim in 1977, and independently from Goldin, Menikoff, & Sharp in 1980-81. In 2020, experimentalists successfully created anyonic excitations. This paper discusses why the possibility of quantum particles in two-dimensional space with intermediate exchange statistics eluded physicists for so long after bosons and fermions were understood. The history suggests ideas for the preparation of future researchers. I conclude by addressing failures to attribute scientific achievements accurately. Such practices disproportionately hurt women and minorities in physics, and are harmful to science.

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Dora Musielak

Tue Dec 27 2022 10:26:49 (3 days)

# 13.

Euler stressed the importance of hypotheses, which he thought were the only means of arriving at a certain knowledge of the physical causes, essential to establish the laws of physics. This thought was communicated to \’Emilie du Ch\^atelet in response to hers when she debated the nature of forces, defending vis viva. In this paper, I examine the topics Euler discussed and place them in a context with the scientific and philosophical research of the seventeenth and eighteenth centuries that sought to establish the principles of nature. The source of this analysis centers on a fragment of an undated letter addressed to Ch\^atelet discovered in the archives of the Leningrad Archive of the Soviet Academy of Sciences, a piece which has received little attention. Albeit incomplete, the Euler-Ch\^atelet correspondence is historically and culturally important because the ideas addressed are part of the knowledge base of the development of physics, mathematics, and natural philosophy.

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Aurélien Drezet

Tue Dec 27 2022 10:26:47 (3 days)

# 14.

In order to celebrate this double birthday the journal Foundations of Physics publishes a topical collection `Pilot-wave and beyond’ on the developments that have followed the pioneering works of Louis de Broglie and David Bohm on quantum foundations. This topical collection includes contributions from physicists and philosophers debating around the world about the scientific legacy of Bohm and de Broglie concerning the interpretation and understanding of quantum mechanics. In these forewords we give a general review of the historical context explaining how de Broglie and Bohm developed their interpretations of quantum mechanics. We further analyze the relationship between these two great thinkers and emphasize the role of several collaborators and continuators of their ontological approach to physics.

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Feraz Azhar, Alan H. Guth, Mohammad Hossein Namjoo

Tue Dec 27 2022 10:26:46 (3 days)

# 15.

In “Defeating Dr. Evil with Self-Locating Belief”, Adam Elga proposes and defends a principle of indifference for self-locating beliefs: if an individual is confident that his world contains more than one individual who is in a state subjectively indistinguishable from his own, then he should assign equal credences to the hypotheses that he is any one of these individuals. Through a sequence of thought experiments, Elga in effect claims that he can derive the credence function that should apply in such situations, thus justifying his principle of indifference. Here we argue, using a Bayesian approach, that Elga’s reasoning is circular: in analyzing the third of his thought experiments, he uses an assertion that is justifiable only if one assumes, from the start, the principle of indifference that he is attempting to justify. We agree with Elga that the assumption of equal credences is a very reasonable principle, in the absence of any reason to assign unequal credences, but we do not agree that the equality of credences can be so derived.

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Antony Valentini

Mon Dec 26 2022 10:10:48 (4 days)

# 16.

We have recently developed a new understanding of probability in quantum gravity. In this paper we provide an overview of this new approach and its implications. Adopting the de Broglie-Bohm pilot-wave formulation of quantum physics, we argue that there is no Born rule at the fundamental level of quantum gravity with a non-normalisable Wheeler-DeWitt wave functional $\Psi$. Instead the universe is in a perpetual state of quantum nonequilibrium with a probability density $P\neq\left\vert \Psi\right\vert ^{2}$. Dynamical relaxation to the Born rule can occur only after the early universe has emerged into a semiclassical or Schr\”{o}dinger approximation, with a time-dependent and normalisable wave functional $\psi$, for non-gravitational systems on a classical spacetime background. In that regime the probability density $\rho$ can relax towards $\left\vert \psi\right\vert ^{2}$ (on a coarse-grained level). Thus the pilot-wave theory of gravitation supports the hypothesis of primordial quantum nonequilibrium, with relaxation to the Born rule taking place soon after the big bang. We also show that quantum-gravitational corrections to the Schr\”{o}dinger approximation allow quantum nonequilibrium $\rho\neq\left\vert \psi\right\vert ^{2}$ to be created from a prior equilibrium ($\rho=\left\vert \psi\right\vert ^{2}$) state. Such effects are very tiny and difficult to observe in practice.

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Marcello Poletti

Mon Dec 26 2022 10:10:47 (4 days)

# 17.

Here we continue with the ideas expressed in “On the strangeness of quantum mechanics” aiming to demonstrate more concretely how this philosophical outlook might be used as a key for resolving the measurement problem. We will address in detail the problem of determining how the concept of undecidability leads to substantial changes to classical theory of probability by showing how such changes produce a theory that coincides with the principles underlying quantum mechanics.

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