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Sat Jul 08 2023 00:30:42 (8 hours)
# 1.
Adlam, Emily (2023) Are Entropy Bounds Epistemic? [Preprint]
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Sat Jul 08 2023 00:30:09 (8 hours)
# 2.
Adlam, Emily (2023) Disappearing Without a Trace: The Arrows of Time in Kent’s Solution to the Lorentzian Quantum Reality Problem. [Preprint]
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Fri Jul 07 2023 11:52:37 (20 hours)
# 3.
Roberts, Bryan W. (2023) Does thermodynamics have a reversibility problem? [Preprint]
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physics.hist-ph updates on arXiv.org
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R. E. Kastner, Andreas Schlatter
Fri Jul 07 2023 09:07:51 (23 hours)
# 4.
A form of Landauer’s Principle is shown to hold for thermal systems by reference to the joint entropy associated with conjugate observables. It is shown that the source of the compensating entropy for irreversible physical processes is due to the irreducible uncertainty attending values of such mutually incompatible observables. The relevant irreversibility is argued to be that of quantum measurement rather than erasure of classical memory devices, as commonly assumed.
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Claudia-Elisabeth Wulz
Fri Jul 07 2023 09:07:50 (23 hours)
# 5.
The fascinating story of a major discovery at CERN is outlined. The bold decision to convert its most powerful, and only recently inaugurated, proton accelerator to a proton-antiproton collider led to the discovery of the W and Z bosons — mediators of the weak interaction — in a record time, at the experiments UA1 and UA2. The decisive roles of Carlo Rubbia and Simon van der Meer, who received the 1984 Nobel Prize for physics, are underlined.
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by
Andrea Carosso
Fri Jul 07 2023 09:07:49 (23 hours)
# 6.
We describe the picture of physical processes suggested by Edward Nelson’s stochastic mechanics when generalized to quantum field theory, after an introductory review of his theory applied to the hydrogen atom. By performing numerical simulations of the relevant stochastic processes, we observe that Nelson’s theory provides an intuitive account of how particles can arise from an underlying field “beable” — to use a phrase of John S. Bell — in the case of free field theory, regularized on a lattice. We then argue that this picture looks qualitatively similar when generalized to interacting scalar field theory. Lastly, we compare the Nelsonian framework to various other proposed ontologies for QFT, and remark upon their relative merits in light of the effective field theory paradigm.
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Ravi Kunjwal, Ognyan Oreshkov
Fri Jul 07 2023 09:07:46 (23 hours)
# 7.
Causal inequalities are device-independent constraints on correlations realizable via local operations under the assumption of definite causal order between these operations. While causal inequalities in the bipartite scenario require nonclassical resources within the process-matrix framework for their violation, there exist tripartite causal inequalities that admit violations with classical resources. The tripartite case puts into question the status of a causal inequality violation as a witness of nonclassicality, i.e., there is no a priori reason to believe that quantum effects are in general necessary for a causal inequality violation. Here we propose a notion of classicality for correlations–termed deterministic consistency–that goes beyond causal inequalities. We refer to the failure of deterministic consistency for a correlation as its antinomicity, which serves as our notion of nonclassicality. Deterministic consistency is motivated by a careful consideration of the appropriate generalization of Bell inequalities–which serve as witnesses of nonclassicality for non-signalling correlations–to the case of correlations without any non-signalling constraints. This naturally leads us to the classical deterministic limit of the process matrix framework as the appropriate analogue of a local hidden variable model. We then define a hierarchy of sets of correlations–from the classical to the most nonclassical–and prove strict inclusions between them. We also propose a measure for the antinomicity of correlations–termed ‘robustness of antinomy’–and apply our framework in bipartite and tripartite scenarios. A key contribution of this work is an explicit nonclassicality witness that goes beyond causal inequalities, inspired by a modification of the Guess Your Neighbour’s Input (GYNI) game that we term the Guess Your Neighbour’s Input or NOT (GYNIN) game.
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| Quantum Gravitational Corrections to Electromagnetism And Backreaction. (arXiv:2307.02580v1 [gr-qc]) |
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Sanjib Katuwal
Fri Jul 07 2023 09:07:44 (23 hours)
# 8.
This dissertation examines the impact of quantum gravity on electromagnetism and its backreaction, using perturbative general relativity as an effective field theory. Our analysis involves quantum-correcting Maxwell’s equations to obtain a gauge-independent, real, and causal effective field equation that describes quantum gravitational effects on electromagnetism. Additionally, we present a perturbative mechanism through which quantum gravity induces a dimension six coupling between a massive scalar and electromagnetism. To investigate the effects of electromagnetism on the gravitational sector, we derive an exact, dimensionally regulated, Fourier mode sum for the Lorentz gauge propagator of a massive photon on an arbitrary cosmological background supported by a scalar inflaton. This allows us to calculate the effective potential induced by photons. Finally, we use a similar Fourier mode sum for a time-dependent mass to study the effective force on the inflaton 0-mode and its impact on reheating.
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Joshua Foo, Magdalena Zych
Fri Jul 07 2023 09:07:42 (23 hours)
# 9.
Recent results in relativistic quantum information and quantum thermodynamics have independently shown that in the quantum regime, a system may fail to thermalise when subject to quantum-controlled application of the same, single thermalisation channel. For example, an accelerating system with fixed proper acceleration is known to thermalise to an acceleration-dependent temperature, known as the Unruh temperature. However, the same system in a superposition of spatially translated trajectories that share the same proper acceleration fails to thermalise. Here, we provide an explanation of these results using the framework of quantum field theory in relativistic noninertial reference frames. We show how a probe that accelerates in a superposition of spatial translations interacts with incommensurate sets of field modes. In special cases where the modes are orthogonal (for example, when the Rindler wedges are translated in a direction orthogonal to the plane of motion), thermalisation does indeed result, corroborating the here provided explanation. We then discuss how this description relates to an information-theoretic approach aimed at studying quantum aspects of temperature through quantum-controlled thermalisations. The present work draws a connection between research in quantum information, relativistic physics, and quantum thermodynamics, in particular showing that relativistic quantum effects can provide a natural realisation of quantum thermodynamical scenarios.
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Fri Jul 07 2023 01:24:08 (1 day)
# 10.
Van Strien, Marij (2023) Why Bohm was never a determinist. [Preprint]
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Wed Jul 05 2023 01:09:52 (3 days)
# 11.
Callender, Craig (2023) The Prodigy That Time Forgot: The Incredible and Untold Story of John von Newton. [Preprint]
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Wed Jul 05 2023 01:08:49 (3 days)
# 12.
Gao, Shan (2023) Why the ontology of Bohmian mechanics cannot include only particles or particles and the wave function. [Preprint]
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Niklas Müller; Sascha Schäfer
Tue Jul 04 2023 08:00:00 (4 days)
# 13.
Nature Physics, Published online: 04 July 2023; doi:10.1038/s41567-023-02119-y
Multi-colour light fields allow a nonlinear coupling between free electrons and propagating light by stimulated Compton scattering, without the need for near fields to mediate the interaction.
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Mon Jul 03 2023 01:13:24 (5 days)
# 14.
El Skaf, Rawad and Stuart, Michael T. (2023) Scientific Models and Thought Experiments: Same Same but Different. [Preprint]
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Mon Jul 03 2023 01:12:28 (5 days)
# 15.
Wallace, David (2023) Thermodynamics with and without irreversibility. [Preprint]
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Mon Jul 03 2023 01:11:25 (5 days)
# 16.
Wallace, David (2023) On relativistic temperature. [Preprint]
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Sun Jul 02 2023 01:36:44 (6 days)
# 17.
Glick, David (2023) The Principle of Least Action and Teleological Explanation in Physics. [Preprint]
