What did Bell really prove?

Jean Bricmont Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” The goal of this paper is to give a pedagogical introduction to Bell’s theorem and its implication for our view of the physical world, in particular how it establishes the existence of non local effects or of actions at a distance. We also discuss several misunderstandings… Read more →

Submitted paper: Haag’s Theorem as a Reason to Reconsider Direct-Action Theories

ABSTRACT. It is argued that the severe consequences of Haag’s inconsistency theorem for quantum field theories can be successfully evaded in the direct-action approach. Some recent favorable comments of John Wheeler, often mistakenly presumed to have abandoned his own (and Feynman’s) direct-action theory, together with the remarkable immunity of direct-action quantum electrodynamics to Haag’s theorem, suggest that it may well… Read more →

Weekly Papers on Quantum Foundations (47)

This is a list of this week’s papers on quantum foundations published in the various journals or uploaded to the preprint servers such as arxiv.org and PhilSci Archive. Holographic Signatures of Cosmological Singularities. (arXiv:1404.2309v3 [hep-th] UPDATED) gr-qc updates on arXiv.org on 2014-11-21 9:07am GMT Authors: Netta Engelhardt, Thomas Hertog, Gary T. Horowitz To gain insight in the quantum nature of cosmological singularities, we… Read more →

John Stuart Bell: recollections of a great scientist and a great man

John Stuart Bell: recollections of a great scientist and a great man

This contribution to the book in honour of J.S. Bell will probably differ from the remaining ones, in particular since only a part of it will be devoted to specific technical arguments. In fact I have considered appropriate to share with the community of physicists interested in the foundational problems of our best theory the repeated interactions I had with… Read more →

Weekly Papers on Quantum Foundations (46)

This is a list of this week’s papers on quantum foundations published in the various journals or uploaded to the preprint servers such as arxiv.org and PhilSci Archive. Waiting for the quantum bus: The flow of negative probability ScienceDirect Publication: Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics on 2014-11-15 10:51am… Read more →

Weekly Papers on Quantum Foundations (45)

This is a list of this week’s papers on quantum foundations published in the various journals or uploaded to the preprint servers such as arxiv.org and PhilSci Archive. The large-scale structure of vacuum. (arXiv:1405.3900v2 [gr-qc] UPDATED) gr-qc updates on arXiv.org on 2014-11-07 4:50am GMT Authors: F. D. Albareti, J. A. R. Cembranos, A. L. Maroto The vacuum state in quantum field theory is… Read more →

Weekly Papers on Quantum Foundations (44)

Non-reflexive Logical Foundation for Quantum Mechanics Latest Results for Foundations of Physics on 2014-11-02 12:00am GMT Abstract On the one hand, non-reflexive logics are logics in which the principle of identity does not hold in general. On the other hand, quantum mechanics has difficulties regarding the interpretation of ‘particles’ and their identity, also known in the literature as ‘the problem… Read more →

Quantum Phenomena Modeled by Interactions between Many Classical Worlds

Michael J. W. Hall, Dirk-André Deckert, and Howard M. Wiseman, Quantum phenomena modelled by interactions between many classical worlds. Phys. Rev. X 4 041013 [17 pages] (2014). At the request of Dr Shan Gao, I’m posting here a short discussion of this new paper. This work is motivated by the quantum measurement problem, which suggests that orthodox quantum mechanics does not… Read more →