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by
Jelle Hartong, Niels A. Obers, Gerben Oling
Fri Dec 23 2022 11:08:27 (22 hours)
# 1.
We review the history of Newton-Cartan gravity with an emphasis on recent developments, including the covariant, off-shell large speed of light expansion of general relativity. Depending on the matter content, this expansion either leads to Newton-Cartan geometry with absolute time or to Newton-Cartan geometry with non-relativistic gravitational time dilation effects. The latter shows that non-relativistic gravity includes a strong field regime and goes beyond Newtonian gravity. We start by reviewing early developments in Newton-Cartan geometry, including the covariant description of Newtonian gravity, mainly through the works of Trautman, Dautcourt, K\”unzle and Ehlers. We then turn to more modern developments, such as the gauging of the Bargmann algebra, and we describe why the latter cannot be used to find an off-shell covariant description of Newtonian gravity. We review recent work on the $1/c$ expansion of general relativity and show that this leads to an alternative `type II’ notion of Newton-Cartan geometry. Finally, we discuss matter couplings, solutions and odd powers in $1/c$, and we conclude with a brief summary of related topics.
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Fri Dec 23 2022 06:50:58 (1 day)
# 2.
Dewar, Neil (2022) Equivalence and Convention. In: UNSPECIFIED.
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PRL: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.
by
Anne-Catherine de la Hamette, Stefan L. Ludescher, and Markus P. Müller
Thu Dec 22 2022 18:00:00 (1 day)
# 3.
Author(s): Anne-Catherine de la Hamette, Stefan L. Ludescher, and Markus P. Müller
In the quantization of gauge theories and quantum gravity, it is crucial to treat reference frames such as rods or clocks not as idealized external classical relata, but as internal quantum subsystems. In the Page-Wootters formalism, for example, evolution of a quantum system S is described by a sta…
[Phys. Rev. Lett. 129, 260404] Published Thu Dec 22, 2022
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physics.hist-ph updates on arXiv.org
by
Renxin Xu (PKU)
Thu Dec 22 2022 11:59:09 (1 day)
# 4.
In the late age of developing quantum mechanics, Lev Landau, one of the distinguished players, made great efforts to understand the nature of matter, even stellar matter, by applying the quantum theory. Ninety years ago, he published his idea of “neutron” star, which burst upon him during his visit over Europe in the previous year. The key point that motivated Landau to write the paper is to make a state with lower energy for “gigantic nucleus”, avoiding extremely high kinematic energy of electron gas due to the new Fermi-Dirac statistics focused hotly on at that time. Landau had no alternative but to neutronize/neutralize by “combining a proton and an electron”, as electron and proton were supposed to be elementary before the discovery of neutron. However, our understanding of the Nature has fundamentally improved today, and another way (i.e., strangeonization) could also embody neutralization and thus a low-energy state that Landau had in mind, which could further make unprecedented opportunities in this multi-messenger era of astronomy. Strangeon matter in “old” physics may impact dramatically on today’s physics, from compact stars initiated by Landau, to cosmic rays and dark matter. In this essay, we are making briefly the origin and development of neutron star concept to reform radically, to remember Landau’s substantial contribution in astrophysics and to recall those peculiar memories.
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physics.hist-ph updates on arXiv.org
by
Rüdiger Schack
Thu Dec 22 2022 11:59:08 (1 day)
# 5.
Following earlier work by Michel Bitbol (Bitbol 2020) and Laura de la Tremblaye (de La Tremblaye 2020) which examines QBism from the perspective of phenomenology, this short paper explores points of contact between QBism and Maurice Merleau-Ponty’s essay The intertwining — the chiasm.
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PRL: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.
by
Marko Toroš, Marion Cromb, Mauro Paternostro, and Daniele Faccio
Wed Dec 21 2022 18:00:00 (2 days)
# 6.
Author(s): Marko Toroš, Marion Cromb, Mauro Paternostro, and Daniele Faccio
Many phenomena and fundamental predictions, ranging from Hawking radiation to the early evolution of the Universe rely on the interplay between quantum mechanics and gravity or more generally, quantum mechanics in curved spacetimes. However, our understanding is hindered by the lack of experiments t…
[Phys. Rev. Lett. 129, 260401] Published Wed Dec 21, 2022
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Wed Dec 21 2022 03:05:45 (3 days)
# 7.
Boge, Florian J. (2022) Back to Kant! QBism, Phenomenology, and Reality from Invariants. [Preprint]
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physics.hist-ph updates on arXiv.org
by
Reidun Renstrøm, Nils-Erik Bomark
Tue Dec 20 2022 09:13:21 (4 days)
# 8.
Most physics textbooks at college and university level introduce quantum physics in a historical context. However, the textbook version of this history does not match the actual history. In this article, the first in a series of articles looking at the textbook description of the quantum history, we follow an exceptional student through her endeavors to understand the early atomic models that led up to the work of Niels Bohr. We experience her disappointment when she discovers that the description of the famous atomic model by Thomson, is a mere caricature with almost no trace of Thomson’s work and that the supposedly important radiative instability of Rutherford’s atoms, is not there at all; how could it be? Rutherford did not even discuss the motion of the electrons. These flaws in the narrative are not just cosmetic inaccuracies, the main narrative is centered around claims that are simply wrong or non-existent in the real story and thus rendering the whole telling mere fiction. We as a physics community should do better.
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Mon Dec 19 2022 12:03:13 (4 days)
# 9.
Danne, Nicholas (2022) Is Fourier Analysis Conservative over Physical Theory? [Preprint]
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Mon Dec 19 2022 12:01:13 (4 days)
# 10.
Baron, Sam and Le Bihan, Baptiste (2023) Causal Theories of Spacetime. [Preprint]
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Sun Dec 18 2022 02:24:51 (6 days)
# 11.
Price, Huw and Wharton, Ken (2022) Why entanglement? [Preprint]
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Sat Dec 17 2022 03:17:07 (1 week)
# 12.
Sartori, Lorenzo (2022) Putting the ‘Experiment’ Back into the ‘Thought Experiment’. [Preprint]
