Weekly Papers on Quantum Foundations (31)

This is a list of this week’s papers on quantum foundations published in various journals or uploaded to preprint servers such as arxiv.org and PhilSci Archive.

New constraints on quantum foam models from X-ray and gamma-ray observations of distant quasars. (arXiv:1607.08551v1 [astro-ph.CO])

gr-qc updates on arXiv.org

on 2016-7-30 9:08am GMT

Authors: Eric S. Perlman (FIT), Saul A. Rappaport (MIT), Y. Jack NgWayne A. Christiansen (UNC), John DeVore (Visidyne, Inc.),David Pooley (Trinity U.)

Astronomical observations of distant quasars may be important to test models for quantum gravity, which posit Planck-scale spatial uncertainties (‘spacetime foam’) that would produce phase fluctuations in the wavefront of radiation emitted by a source, which may accumulate over large path lengths. We show explicitly how wavefront distortions cause the image intensity to decay to the point where distant objects become undetectable if the accumulated path-length fluctuations become comparable to the wavelength of the radiation. We also reassess previous efforts in this area. We use X-ray and gamma-ray observations to rule out several models of spacetime foam, including the interesting random-walk and holographic models.

Particles in a Quantum Ontology of Properties

Philsci-Archive: No conditions. Results ordered -Date Deposited.

on 2016-7-29 6:40pm GMT

Lombardi, Olimpia and Dieks, Dennis (2014) Particles in a Quantum Ontology of Properties. [Preprint]

Quantum Information and Locality

Philsci-Archive: No conditions. Results ordered -Date Deposited.

on 2016-7-29 6:37pm GMT

Dieks, Dennis (2016) Quantum Information and Locality. [Preprint]

Probabilistic logic of quantum observations. (arXiv:1607.08369v1 [math.LO])

quant-ph updates on arXiv.org

on 2016-7-29 9:59am GMT

Authors: A. SernadasJ. RasgaC. SernadasL. AlcácerA. B. Henriques

A probabilistic propositional logic, endowed with an epistemic component, is presented and illustrated for reasoning about the random results of projective measurements made on a given quantum state. A sound and weakly complete axiomatization is provided. The proposed logic is proved to be a conservative extension of classical propositional logic.

Looking for the Source of Change

Latest Results for Foundations of Physics

on 2016-7-29 12:00am GMT

Abstract

In most theories of the quantum measurement process changes in an observer’s perception of a state can take place without forces, as for example if a state is prepared in an eigenstate of \(J_x\) (x component of angular momentum) but \(J_z\) is measured. In the “special state” theory (explained in the previous article) any change in wave function requires forces. This allows experimental tests to distinguish these ideas and in the present article two examples of such tests are considered. The first is a kind of double Stern–Gerlach experiment, the second a check for angular momentum changes in a polarizer.

Is a time symmetric interpretation of quantum theory possible without retrocausality?

Philsci-Archive: No conditions. Results ordered -Date Deposited.

on 2016-7-27 11:03pm GMT

Leifer, Matthew and Pusey, Matthew (2016) Is a time symmetric interpretation of quantum theory possible without retrocausality? In: UNSPECIFIED.

Taking up Superspace—What would it take to be a realist about superspace?

Philsci-Archive: No conditions. Results ordered -Date Deposited.

on 2016-7-27 10:58pm GMT

Menon, Tushar (2016) Taking up Superspace—What would it take to be a realist about superspace? In: UNSPECIFIED.

Cosmology without time: What to do with a possible signature change from quantum gravitational origin?. (arXiv:1607.07589v1 [gr-qc])

hep-th updates on arXiv.org

on 2016-7-27 11:28am GMT

Authors: Aurélien BarrauJulien Grain

Within some approaches to loop quantum cosmology, the existence of an Euclidean phase at high density has been suggested. In this article, we try to explain clearly what are the observable consequences of this possible disappearance of time. Depending on whether it is a real fundamental effect or just an instability in the equation of motion, we show that very different conclusions should be drawn. We finally mention some possible consequences of this phenomenon in the black hole sector.

Three Myths About Time Reversal in Quantum Theory

Philsci-Archive: No conditions. Results ordered -Date Deposited.

on 2016-7-26 5:24pm GMT

Roberts, Bryan W. (2016) Three Myths About Time Reversal in Quantum Theory. [Published Article or Volume]

Violation of the Leggett-Garg Inequality in Neutrino Oscillations

PRL Editors’ Suggestions

on 2016-7-26 2:00pm GMT

Author(s): J. A. Formaggio, D. I. Kaiser, M. M. Murskyj, and T. E. Weiss

An experiment similar to the Bell inequality test confirms that neutrino oscillation is a quantum physics effect that is incompatible with alternative classical models.

[Phys. Rev. Lett. 117, 050402] Published Tue Jul 26, 2016

Quantum information or quantum coding?

Philsci-Archive: No conditions. Results ordered -Date Deposited.

on 2016-7-25 8:59pm GMT

Lombardi, Olimpia and López, Cristian (2016) Quantum information or quantum coding? In: UNSPECIFIED.

Boltzmannian Equilibrium in Stochastic Systems

Philsci-Archive: No conditions. Results ordered -Date Deposited.

on 2016-7-23 10:17pm GMT

Werndl, Charlotte and Frigg, Roman (2016) Boltzmannian Equilibrium in Stochastic Systems. [Preprint]

 

Article written by

editor