Weekly Papers on Quantum Foundations (47)

valiaallori, Valia (2020) Some Reflections on the Statistical Postulate: Typicality, Probability and Explanation between Deterministic and Indeterministic Theories. [Preprint]

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Towards a Structuralist Elimination of Properties

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Fri Nov 18 2022 03:54:30 (1 day)

# 10.

valiaallori, Valia (2021) Towards a Structuralist Elimination of Properties. [Preprint]

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Spontaneous Localization Theories with a Particle Ontology

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Fri Nov 18 2022 03:53:08 (1 day)

# 11.

Allori, Valia (2020) Spontaneous Localization Theories with a Particle Ontology. [Preprint]

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Fundamental Objects without Fundamental Properties: A Thin-object-orientated Metaphysics Grounded on Structure

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Fri Nov 18 2022 03:51:58 (1 day)

# 12.

Allori, Valia (2021) Fundamental Objects without Fundamental Properties: A Thin-object-orientated Metaphysics Grounded on Structure. [Preprint]

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Why Scientific Realists Should Reject the Second Dogma of Quantum Mechanics

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Fri Nov 18 2022 03:51:00 (1 day)

# 13.

Allori, Valia (2020) Why Scientific Realists Should Reject the Second Dogma of Quantum Mechanics. [Preprint]

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UnBorn: Probability in Bohmian Mechanics

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Fri Nov 18 2022 03:49:25 (1 day)

# 14.

Ruetsche, Laura (2022) UnBorn: Probability in Bohmian Mechanics. In: UNSPECIFIED.

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Thermodynamic Uncertainty Relation in Interacting Many-Body Systems

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

Timur Koyuk and Udo Seifert

Thu Nov 17 2022 18:00:00 (1 day)

# 15.

Author(s): Timur Koyuk and Udo Seifert

The thermodynamic uncertainty relation (TUR) has been well studied for systems with few degrees of freedom. While, in principle, the TUR holds for more complex systems with many interacting degrees of freedom as well, little is known so far about its behavior in such systems. We analyze the TUR in t…

[Phys. Rev. Lett. 129, 210603] Published Thu Nov 17, 2022

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Where and why does Einstein-Scalar-Gauss-Bonnet theory break down?. (arXiv:2211.08477v1 [gr-qc])

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gr-qc updates on arXiv.org

Abhishek Hegade K. R., Justin L. Ripley, Nicolás Yunes

Thu Nov 17 2022 11:50:12 (1 day)

# 16.

We present a systematic exploration of the loss of predictivity in Einstein-scalar-Gauss-Bonnet (ESGB) gravity. We first formulate a gauge covariant method of characterizing the breakdown of the hyperbolicity of the equations of motion in the theory. With this formalism, we show that strong geodesic focusing leads to the breakdown of hyperbolicity, and the latter is unrelated to the violation of the null convergence condition. We then numerically study the hyperbolicity of the equations during gravitational collapse for two specific ESGB gravity theories: “shift symmetric Gauss-Bonnet gravity” and a version of the theory that admits “spontaneously scalarized” black holes. We devise a “phase space” model to describe the end states for a given class of initial data. Using our phase space picture, we demonstrate that the two theories we consider remain predictive (hyperbolic) for a range of GB couplings. The range of couplings, however, is small, and thus, the presence of “spontaneously scalarized” solutions requires fine-tuning of initial data. Our results, therefore, cast doubt as to whether scalarized black hole solutions can be realistically realized in Nature even if ESGB gravity happened to be the correct gravitational description.

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Gravito-diamagnetic forces for mass independent large spatial quantum superpositions. (arXiv:2211.08435v1 [quant-ph])

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quant-ph updates on arXiv.org

Run Zhou, Ryan J. Marshman, Sougato Bose, Anupam Mazumdar

Thu Nov 17 2022 11:50:10 (1 day)

# 17.

Testing the quantum nature of gravity in a laboratory via entanglement requires us to create a massive spatial quantum superposition, i.e. the Schr\”odinger cat state, where the mass and the superposition ought to be around $10^{-15}-10^{-14}$ kg and $\Delta x \sim 10-100~\mu {\rm m}$. Creating such a massive spatial quantum superposition pose incredible challenges. The methods employed so far rely either on wavepacket expansion or on a quantum ancilla, e.g. single spin dependent forces, scale inversely with mass (e.g. force per unit time has to be proportionately enhanced). In this paper, we will show that gravitational acceleration along with the diamagnetic repulsion can achieve a complete “release” and “catch” interferometry in the course of which a large spatial superposition in generated in a relatively short time. After first creating a modest initial spatial superposition $1~\mu {\rm m}$ (e.g. using Stern-Gerlach), we will show that we can achieve an $\sim 10^{3}$ fold improvement to the spatial superposition ($1~{\rm \mu m}\rightarrow 965~\mu {\rm m}$) between the wave packets in just $0.034$ s by using the Earth’s gravitational acceleration and then the diamagnetic repulsive scattering of the nanocrystal, neither of which depend on the object mass. In fact, we will be able to slow down the wavepackets to almost zero velocities before we can capture them in the Stern-Gerlach apparatus to close the interferometer.

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On the existence of other universes. (arXiv:1306.2266v2 [physics.hist-ph] UPDATED)

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physics.hist-ph updates on arXiv.org

Jonathan M. M. Hall

Thu Nov 17 2022 11:50:10 (1 day)

# 18.

Natural philosophy necessarily combines the process of scientific observation with an abstract (and usually symbolic) framework, which provides a logical structure to the practice and development of a scientific theory. The metaphysical underpinning of science includes statements about the process of science itself, and the nature of both the philosophical and material objects involved in a scientific investigation. By developing a formalism for an abstract mathematical description of inherently non-mathematical (physical) objects, an attempt is made to clarify the mechanisms and implications of the philosophical tool of Ansatz. Outcomes of this style of analysis include a possible explanation for the philosophical issue of the ‘unreasonable effectiveness’ of mathematics as raised by Wigner, and an investigation into formal definitions of the terms: ‘principles’, ‘evidence’, ‘existence’ and ‘universes’, that are consistent with the conventions used in physics.

It is found that the formalism places restrictions on the mathematical properties of objects that represent the tools and terms mentioned above. This allows one to make testable predictions regarding physics itself (where the nature of the tools of investigation is now entirely abstract) just as scientific theories make predictions about the universe at hand. That is, the mathematical structure of objects defined within the new formalism has philosophical consequences (via logical arguments) that lead to profound insights into the nature of the universe, which may serve to guide the course of future investigations in science and philosophy, and precipitate inspiring new avenues of integrated research.

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Living Objects

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Thu Nov 17 2022 06:39:59 (2 days)

# 19.

Hermida, Margarida and Ladyman, James (2022) Living Objects. [Preprint]

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New Historical and Philosophical Perspectives on Quantitative Genetics

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Thu Nov 17 2022 06:36:56 (2 days)