Recollections of John Bell

Michael Nauenberg Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” It is a pleasure to contribute to this anthology some of my recollections of John Bell. I first met him at SLAC, when we were visitors during 1964-65 when he was on leave from CERN, and I was on leave from the Columbia University Physics Department…. Read more →

The Assumptions of Bell’s Proof

Roderich Tumulka Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” While it is widely agreed that Bell’s theorem is an important result in the foundations of quantum physics, there is much disagreement about what exactly Bell’s theorem shows. It is agreed that Bell derived a contradiction with experimental facts from some list of assumptions, thus showing… Read more →

What Retrocausal Explanations Look Like

Ken Wharton Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” While it is generally known that retrocausal models can provide an account of Bell-inequality violations in terms of spacetime-local beables, new models can now explicitly show how this comes about. By analyzing a simple local-beable model that precisely recovers the quantum joint probabilities for measurements on… Read more →

Weekly Papers on Quantum Foundations (51)

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. Quantum space-time of a charged black hole. (arXiv:1412.6055v1 [gr-qc]) gr-qc updates on arXiv.org on 2014-12-20 2:26am GMT Authors: Rodolfo Gambini, Esteban Mato Capurro, Jorge Pullin We quantize spherically symmetric electrovacuum gravity. The algebra of Hamiltonian… Read more →

Non-local beables

I would like to begin with Bell’s remark on the possibility that the beables are non-local, which Tim Maudlin quotes. “Of course, we may be obliged to develop theories in which there are no strictly local beables. That possibility will not be considered here[1].” When I read that yesterday I was astounded because it made me realize that ever since encountering Bell’s theorem as… Read more →

Bell on Bohm

Sheldon Goldstein Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” A memorial conference for John Bell, open to the public, was held at Rutgers University around 20 years ago. I gave there a short talk on Bell’s views about David Bohm’s “hidden variables” formulation of quantum mechanics, a version of quantum mechanics often called the de… Read more →

Strengthening Bell’s Theorem: Removing the Hidden-Variable Assumption

Henry P. Stapp Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” The Bell’s theorem proofs are rightly identified as proofs of the incompatibility of “local realism” with the predictions of quantum mechanics. But “local realism” brings in both alien-to-quantum-theory classical concepts and also an “outcome independence” condition whose inclusion nullifies those theorems as possible proofs of… Read more →

Weekly Papers on Quantum Foundations (50)

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. Maximum Tension: with and without a cosmological constant. (arXiv:1408.1820v3 [gr-qc] UPDATED) gr-qc updates on arXiv.org on 2014-12-14 1:30am GMT Authors: John D. Barrow, G. W. Gibbons We discuss various examples and ramifications of the… Read more →

John Bell Workshop 2014

John Bell Workshop 2014

Bell’s theorem has been called “the most profound discovery of science”. However, there have been controversies on the deep implications of the theorem. The main purpose of this online workshop is to highlight the existing debates and address the controversies. Another purpose is to get some constructive inputs to the forthcoming Bell volume edited by Mary Bell and Shan Gao. This… Read more →

Experimental tests of Bell inequalities

Marco Genovese Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” 1964 was a wonderful year for physics, in this “annus mirabilis”, summarising and simplifying a little, quark model was proposed by Gell-Mann and Zweig and charm and colour properties were introduced, Higgs published his work on the scalar boson, $\Omega$ boson and CP violation were discovered,… Read more →