Received Papers

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

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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 →

Experimental tests of Bell inequalities

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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 →

Quantum Solipsism and Non-Locality

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Travis Norsen Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” J.S. Bell’s remarkable 1964 theorem showed that any theory sharing the empirical predictions of orthodox quantum mechanics would have to exhibit a surprising — and, from the point of view of relativity theory, very troubling — kind of non-locality. Unfortunately, even still on this 50th anniversary,… Read more →

Bell on Bell’s theorem: The changing face of nonlocality

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Harvey R. Brown and Christopher G. Timpson Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” Between 1964 and 1990, the notion of nonlocality in Bell’s papers underwent a profound change as his nonlocality theorem gradually became detached from quantum mechanics, and referred to wider probabilistic theories involving correlations between separated beables. The proposition that standard quantum mechanics… Read more →

Measurement and Macroscopicity: Overcoming Conceptual Imprecision in Quantum Measurement Theory

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Gregg Jaeger Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” John S. Bell, of course, is most well known for the result now referred to simply as “Bell’s theorem”, which removed from consideration the class of so-called local hidden-variable theories which at the time of its publishing appeared to be the most natural class of theories… Read more →

Local Beables and the Foundations of Physics

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Tim Maudlin Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” John Bell’s most celebrated contribution to the foundations of physics is his famous theorem. The theorem demonstrates that any physical theory capable of generating the predictions of the standard quantum-mechanical algorithm, in particular the prediction of violations of Bell’s inequality for experiments done at space-like separation,… Read more →

What did Bell really prove?

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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 →

Interactions and Inequality

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Philip Pearle Submitted to “Quantum Nonlocality and Reality – 50 Years of Bell’s theorem” John Bell was a staunch supporter of the dynamical wave function collapse approach to making a well-defined quantum theory. Through letters from him, I reminisce on my handful of interactions with him, all of which were memorable to me. Then, non-locality, violation of Bell’s inequality and… Read more →

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

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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 →

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

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

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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 →

Quantum Nonlocality Explained (Open Review Paper)

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The preposterous title of this post is also the title of my contribution to the Special Issue on Quantum Nonlocality and Reality — 50 Years of Bell’s theorem. Abstract: Quantum theory’s violation of remote outcome independence is assessed in the context of a novel interpretation of the theory, in which the unavoidable distinction between the classical and quantum domains is… Read more →