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Sat Aug 05 2023 00:58:16 (8 hours)
# 1.
Fankhauser, Johannes and Read, James (2023) Gravitational redshift revisited: inertia, geometry, and charge. [Preprint]
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R.L. Lechuga, D. Sudarsky, Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México
Fri Aug 04 2023 12:18:58 (21 hours)
# 2.
The eternal inflation problem continues to be considered one of standard’s cosmology most serious shortcomings. This arises when one considers the effects of “quantum fluctuations” (QF) on the zero mode of inflaton field during a Hubble time in the inflationary epoch. In the slow-roll regime it is quite clear that such QF could dwarf the classical rolling down of the inflaton, and with overwhelming probability this prevents inflation from ever ending. When one recognizes that QF can not be taken as synonymous of stochastic fluctuations, but rather intrinsic levels of indefiniteness in the quantities, one concludes that the eternal inflation problem simply does not exist. However, the same argument would serve to invalidate the account for the generation of the primordial seeds of cosmic structure. In order to do address that issue, one must explain the breaking of homogeneity and isotropy of the early inflationary epoch. The so called spontaneous collapse theories offer an additional element namely the stochastic and spontaneous state reduction characteristic of those proposals possesses the basic features to break those symmetries. In fact, a version of the CSL theory adapted to the cosmological context has been shown to offer a satisfactory account for the origin the seeds of cosmic structure with an adequate power spectrum, and will serve as the basis of our analysis. However, once such stochastic collapse is introduced into the theoretical framework the eternal inflation problem has the potential reappear. In this manuscript we explore those issues in detail and discuss an avenue that seems to allow for a satisfactory account for the generation of the primordial inhomogeneities and anisotropies while freeing the theory from the eternal inflation problem.
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W. David Wick
Fri Aug 04 2023 12:18:53 (21 hours)
# 3.
In the first paper of this series, I investigated whether a wavefunction model of a heavy particle and a collection of light particles might generate “Brownian-Motion-Like” trajectories of the heavy particle. I concluded that it was possible, but left unsettled the second claim in Einstein’s classical program: diffusive motion, proportional to the square-root of time, as opposed to ballistic motion, proportional to the time. In this paper, I derive a criterion for diffusive motion, as well as an expression for the diffusion coefficient. Unfortunately, as in paper I, no exact solutions are available for the models, making checking the criterion difficult. But a virtue of the method employed here is that, given adequate information about model eigenvalues and eigenfunctions, diffusion can be definitively ruled in or out.
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Fri Aug 04 2023 02:23:15 (1 day)
# 4.
Schneider, Mike D. (2023) On efforts to decouple early universe cosmology and quantum gravity phenomenology. [Preprint]
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Fri Aug 04 2023 02:21:51 (1 day)
# 5.
Weinstein, Galina (2023) Debating the Reliability and Robustness of the Learned Hamiltonian in the Traversable Wormhole Experiment. [Preprint]
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Govind Krishnan.V
Thu Aug 03 2023 10:31:58 (1 day)
# 6.
The field of interpretation of quantum mechanics emerged in an attempt to solve the measurement problem. This turned on the perception that Niels Bohr avoided addressing the measurement problem by taking an instrumentalist view of quantum mechanics. I argue that this view is mistaken and Bohr’s interpretation of quantum mechanics is realist. Moreover, Bohr’s interpretation, which is different from textbook quantum mechanics (which is due more to Von Neumann and Paul Dirac), succeeds in solving the measurement problem. While the claim that Bohr dissolves the measurement problem within the limits of the epistemological framework he assumes has been made by a few authors, rarely has the case been made that Bohr’s project unambiguously and completely overcomes the measurement problem. I make the strong case that Bohr eliminated the measurement problem altogether. For this, I put forward two new postulates through which to make sense of Bohr’s interpretation. The article thus seeks to single out Bohr’s interpretation from the various views that go together under the umbrella of orthodox quantum mechanics, and which have been traditionally considered susceptible to the measurement problem. It shows that Bohr’s interpretation should be classified along with those like hidden variable theories, collapse models, modal interpretations etc., which offer a solution to the measurement problem and are committed to a realist ontology.
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Thu Aug 03 2023 02:31:11 (2 days)
# 8.
Chakrabarty, Manjari (2023) IS FALSIFIABILITY A ‘BLUNT INSTRUMENT’ FOR MODERN PHYSICS? Journal of Philosophical Investigations, 17 (42). pp. 298-316. ISSN 2423-4419
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Thu Aug 03 2023 02:26:49 (2 days)
# 9.
Gao, Shan (2023) Quantum mechanics refutes solipsism: A proof of the existence of an external world. [Preprint]
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Thu Aug 03 2023 02:26:00 (2 days)
# 10.
Christian, Joy (2023) Bell’s Theorem Begs the Question. [Preprint]
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Thu Aug 03 2023 02:25:39 (2 days)
# 11.
Boyd, Nora Mills and Matthiessen, Dana (2023) Observations, Experiments, and Arguments for Epistemic Superiority in Scientific Methodology. [Preprint]
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Wed Aug 02 2023 02:12:39 (3 days)
# 12.
Hirèche, Salim and Linnemann, Niels and Michels, Robert (2023) Are all laws of nature created equal? Meta-laws versus more necessary laws. [Preprint]
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Ali Barzegar, Emilia Margoni, Daniele Oriti
Tue Aug 01 2023 09:50:04 (3 days)
# 13.
We adopt a top-down approach to agency aimed at developing a minimalist, scalable and naturalized account of it. After providing a general definition, we explore some possible extensions and refinements, domain of applicability, as well as a comparison with other recent accounts of agency, and possible objections to our proposal. With respect to what we classify as strong (such as Tononi’s) and weak (such as Rovelli’s) characterizations, our notion of agency situates itself in a middle position – our intent being precisely that of spelling out the advantages of this median account within a variety of contexts, such as the interpretation of quantum mechanics, the debate on the nature of physical laws and Bayesianism.
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Toby Peterken
Tue Aug 01 2023 09:50:03 (3 days)
# 14.
In this work, we attempt to define a notion of compositeness compatible with Quantum Field Theory. Considering the analytic properties of the S-matrix, we conclude that there is no satisfactory definition of compositeness compatible with Quantum Field Theory. Without this notion, one must claim that all bound states are equally fundamental, that is, one cannot rigorously claim that everyday objects are made of atoms or that atoms are made of protons and neutrons. I then show how an approximate notion of compositeness may be recovered in the regime where the mass of a bound state is close to a multi-particle threshold.
Finally, we see that rejecting compositeness solves several of the “problems of everyday objects” encountered in an undergraduate metaphysics course.
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Tue Aug 01 2023 02:50:00 (4 days)
# 15.
Schmitz, Timothy (2023) On Epistemically Useful Physical Computation. [Preprint]
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Mon Jul 31 2023 02:12:51 (5 days)
# 16.
Huber, Franz (2023) Causality, Counterfactuals, and Belief. More Means-End Philosophy. [Preprint]
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Sun Jul 30 2023 08:39:09 (6 days)
# 17.
Barandes, Jacob A. (2019) Can Magnetic Forces Do Work? [Preprint]
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| Manifestly Covariant Lagrangians, Classical Particles with Spin, and the Origins of Gauge Invariance |
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Sun Jul 30 2023 08:38:33 (6 days)
# 18.
Barandes, Jacob A. (2019) Manifestly Covariant Lagrangians, Classical Particles with Spin, and the Origins of Gauge Invariance. [Preprint]
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Sun Jul 30 2023 08:37:47 (6 days)
# 19.
Barandes, Jacob A. (2021) On Magnetic Forces and Work. Foundations of Physics, 51 (4). p. 79.
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Sun Jul 30 2023 08:36:44 (6 days)
# 20.
Barandes, Jacob A. (2021) Gauge Invariance for Classical Massless Particles with Spin. Foundations of Physics, 51 (1). p. 7.
