Weekly Papers on Quantum Foundations (16)

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)

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)

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 →

Realism and Causality II: Retrocausality in Energetic Causal Sets

Eliahu Cohen, Marina Cortês, Avshalom C. Elitzur, Lee Smolin (Submitted on 13 Feb 2019 (v1), last revised 19 Mar 2019 (this version, v2)) https://arxiv.org/abs/1902.05082v2 We describe a new form of retrocausality, which is found in the behaviour of a class of causal set theories, called energetic causal sets (ECS). These are discrete sets of events, connected by causal relations. They have three orders:… Read more →

Realism and causality I: Pilot wave and retrocausal models as possible facilitators

Eliahu Cohen, Marina Cortês, Avshalom C. Elitzur, Lee Smolin (Submitted on 13 Feb 2019 (v1), last revised 19 Mar 2019 (this version, v2)) https://arxiv.org/abs/1902.05108v2 Of all basic principles of classical physics, realism should arguably be the last to be given up when seeking a better interpretation of quantum mechanics. We examine the de Broglie-Bohm pilot wave theory as a well developed example of… Read more →

Weekly Papers on Quantum Foundations (12)

Less is More: Born’s Rule from Quantum Frequentism. (arXiv:1903.12027v1 [quant-ph])  quant-ph updates on arXiv.org on 2019-3-30 1:40am GMT Authors: Lionel Brits Accounting for Born’s rule from first principles remains an open problem among the foundational issues in quantum mechanics. Proponents of the many-worlds interpretation have argued that histories that violate Born’s rule have vanishing norms, and so are unphysical. This argument… Read more →

Weekly Papers on Quantum Foundations (11)

The Wigner function in the relativistic quantum mechanics. (arXiv:1903.08975v1 [quant-ph])  hep-th updates on arXiv.org on 2019-3-23 1:09am GMT Authors: K. Kowalski, J. Rembielinski A detailed study is presented of the relativistic Wigner function for a quantum spinless particle evolving in time according to the Salpeter equation. A Quantum Mechanics Picture. (arXiv:1612.09114v3 [quant-ph] UPDATED)  quant-ph updates on arXiv.org on 2019-3-23 1:08am GMT Authors: Jeconias… Read more →