Weekly Papers on Quantum Foundations (23)

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To be unitary-invariant or not?: a simple but non-trivial proposal for the complexity between states in quantum mechanics/field theory. (arXiv:1906.02063v2 [hep-th] UPDATED)  hep-th updates on arXiv.org on 2019-6-14 1:10pm GMT Authors: Run-Qiu Yang, Yu-Sen An, Chao Niu, Cheng-Yong Zhang, Keun-Young Kim We make comments on some shortcomings of the non-unitary-invariant and non-bi-invariant complexity in quantum mechanics/field theory and argue that the unitary-invariant and bi-invariant complexity… Read more →

Weekly Papers on Quantum Foundations (22)

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Quantum Nature of Black Holes: Fast Scrambling versus Echoes. (arXiv:1906.02653v1 [hep-th])  hep-th updates on arXiv.org on 2019-6-07 1:17pm GMT Authors: Krishan Saraswat, Niayesh Afshordi Two seemingly distinct notions regarding black holes have captured the imagination of theoretical physicists over the past decade: First, black holes are conjectured to be fast scramblers of information, a notion that is further supported through connections to… Read more →

Weekly Papers on Quantum Foundations (21)

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Exploring strong-field deviations from general relativity via gravitational waves. (arXiv:1904.04258v2 [gr-qc] CROSS LISTED)  hep-th updates on arXiv.org on 2019-6-01 12:22am GMT Authors: Steven B. Giddings, Seth Koren, Gabriel Treviño Two new observational windows have been opened to strong gravitational physics: gravitational waves, and very long baseline interferometry. This suggests observational searches for new phenomena in this regime, and in particular for those necessary… Read more →

Weekly Papers on Quantum Foundations (20)

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A different perspective on the problem of time in quantum gravity. (arXiv:1905.09860v1 [gr-qc])  gr-qc updates on arXiv.org on 2019-5-28 12:29am GMT Authors: Mariano Bauer, Cesar Augusto Aguillon, Gustavo Garcia The perspective is advanced that the time parameter in quantum mechanics corresponds to the time coordinate in a Minkowski flat spacetime local approximation to the actual dynamical curved spacetime of General Relativity, rather than… Read more →

Weekly Papers on Quantum Foundations (19)

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Parity violation in weak interactions: How experiment can shape a theoretical framework  ScienceDirect Publication: Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics on 2019-5-18 1:07am GMT Publication date: Available online 17 May 2019 Source: Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics Author(s):… Read more →

Weekly Papers on Quantum Foundations (18)

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The Born rule. (arXiv:1905.03332v1 [quant-ph])  quant-ph updates on arXiv.org on 2019-5-11 1:18am GMT Authors: Yurii V. Brezhnev We deduce the Born rule. No use is required of quantum postulates. One exploits only rudimentary quantum mathematics — a linear, not Hilbert’s, vector space — and empirical notion of the statistical length of a state. Its statistical nature comes from experimental micro-events: the… Read more →

Weekly Papers on Quantum Foundations (17)

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An experimental Scheme for Gravitational Scattering in Microscale: The effect of spatial superposition of mass on the microstructure of space-time. (arXiv:1905.00484v1 [quant-ph])  quant-ph updates on arXiv.org on 2019-5-04 10:15am GMT Authors: Sahar Sahebdivan In this paper, we are exploring the feasibility of observing non-classical features of gravity in a low-energy regime in a quantum optomechanical experiment. If gravity is to have… Read more →

Weekly Papers on Quantum Foundations (16)

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A minisuperspace model of compact phase space gravity. (arXiv:1904.11338v1 [gr-qc])  hep-th updates on arXiv.org on 2019-4-27 12:44am GMT Authors: Danilo Artigas Guimarey, Jakub Mielczarek, Carlo Rovelli The kinematical phase space of classical gravitational field is flat (affine) and unbounded. Because of this, field variables may tend to infinity leading to appearance of singularities, which plague Einstein’s theory of gravity. The purpose of this… Read more →

Weekly Papers on Quantum Foundations (15)

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A new kind of cyclic universe. (arXiv:1904.08022v1 [gr-qc] CROSS LISTED)  hep-th updates on arXiv.org on 2019-4-20 12:59am GMT Authors: Anna Ijjas, Paul J. Steinhardt Combining intervals of ekpyrotic (ultra-slow) contraction with a (non-singular) classical bounce naturally leads to a novel cyclic theory of the universe in which the Hubble parameter, energy density and temperature oscillate periodically, but the scale factor grows by… Read more →

Weekly Papers on Quantum Foundations (13,14)

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Searching for quantum black hole structure with the Event Horizon Telescope. (arXiv:1904.05287v1 [gr-qc] CROSS LISTED)  hep-th updates on arXiv.org on 2019-4-13 1:28am GMT Authors: Steven B. Giddings The impressive images from the Event Horizon Telescope sharpen the conflict between our observations of gravitational phenomena and the principles of quantum mechanics. Two related scenarios for reconciling quantum mechanics with the existence of… Read more →