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.
on 2016-7-30 9:08am GMT
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.
on 2016-7-29 6:40pm GMT
Lombardi, Olimpia and Dieks, Dennis (2014) Particles in a Quantum Ontology of Properties. [Preprint]
on 2016-7-29 6:37pm GMT
Dieks, Dennis (2016) Quantum Information and Locality. [Preprint]
on 2016-7-29 9:59am GMT
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.
on 2016-7-29 12:00am GMT
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.
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.
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.
on 2016-7-27 11:28am GMT
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.
on 2016-7-26 5:24pm GMT
Roberts, Bryan W. (2016) Three Myths About Time Reversal in Quantum Theory. [Published Article or Volume]
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
on 2016-7-25 8:59pm GMT
Lombardi, Olimpia and López, Cristian (2016) Quantum information or quantum coding? In: UNSPECIFIED.
on 2016-7-23 10:17pm GMT
Werndl, Charlotte and Frigg, Roman (2016) Boltzmannian Equilibrium in Stochastic Systems. [Preprint]