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  1.  2
    Hardy’s Paradox as a Demonstration of Quantum Irrealism.Nicholas G. Engelbert & Renato M. Angelo - 2020 - Foundations of Physics 50 (2):105-119.
    Hardy’s paradox was originally presented as a demonstration, without inequalities, of the incompatibility between quantum mechanics and the hypothesis of local causality. Equipped with newly developed tools that allow for a quantitative assessment of realism, here we revisit Hardy’s paradox and argue that nonlocal causality is not mandatory for its solution; quantum irrealism suffices.
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  2.  1
    Reconciling Kinetic and Quantum Theory.B. Gaveau & L. S. Schulman - 2020 - Foundations of Physics 50 (2):55-60.
    We show that in a dilute gas the wave function’s spreading is limited by scattering off other particles. This shows that quantum mechanics can be consistent with the kinetic theory of gases.
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  3.  4
    Relativity and Equivalence in Hilbert Space: A Principle-Theory Approach to the Aharonov–Bohm Effect.Guy Hetzroni - 2020 - Foundations of Physics 50 (2):120-135.
    This paper formulates generalized versions of the general principle of relativity and of the principle of equivalence that can be applied to general abstract spaces. It is shown that when the principles are applied to the Hilbert space of a quantum particle, its law of coupling to electromagnetic fields is obtained. It is suggested to understand the Aharonov-Bohm effect in light of these principles, and the implications for some related foundational controversies are discussed.
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  4.  8
    Randomness? What Randomness?Klaas Landsman - 2020 - Foundations of Physics 50 (2):61-104.
    This is a review of the issue of randomness in quantum mechanics, with special emphasis on its ambiguity; for example, randomness has different antipodal relationships to determinism, computability, and compressibility. Following a philosophical discussion of randomness in general, I argue that deterministic interpretations of quantum mechanics are strictly speaking incompatible with the Born rule. I also stress the role of outliers, i.e. measurement outcomes that are not 1-random. Although these occur with low probability, their very existence implies that the no-signaling (...)
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  5.  4
    On the Spin Projection Operator and the Probabilistic Meaning of the Bipartite Correlation Function.Ana María Cetto, Andrea Valdés-Hernández & Luis de la Peña - 2020 - Foundations of Physics 50 (1):27-39.
    Spin is a fundamental and distinctive property of the electron, having far-reaching implications. Yet its purely formal treatment often blurs the physical content and meaning of the spin operator and associated observables. In this work we propose to advance in disclosing the meaning behind the formalism, by first recalling some basic facts about the one-particle spin operator. Consistently informed by and in line with the quantum formalism, we then proceed to analyse in detail the spin projection operator correlation function \=\left\langle (...)
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  6.  10
    Entropic Mechanics: Towards a Stochastic Description of Quantum Mechanics.Vitaly Vanchurin - 2020 - Foundations of Physics 50 (1):40-53.
    We consider a stochastic process which is described by a continuous-time Markov chain on only short time-scales and constrained to conserve a number of hidden quantities on long time-scales. We assume that the transition matrix of the Markov chain is given and the conserved quantities are known to exist, but not explicitly given. To study the stochastic dynamics we propose to use the principle of stationary entropy production. Then the problem can be transformed into a variational problem for a suitably (...)
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  7.  7
    Nonlocality Versus Modified Realism.Hervé Zwirn - 2020 - Foundations of Physics 50 (1):1-26.
    A large number of physicists now admit that quantum mechanics is a non-local theory. The EPR argument and the many experiments showing the violation of Bell’s inequalities seem to have confirmed convincingly that quantum mechanics cannot be local. Nevertheless, this conclusion can only be drawn inside a standard realist framework assuming an ontic interpretation of the wave function and viewing the collapse of the wave function as a real change of the physical state of the system. We show that this (...)
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  8.  5
    Nonlocality Versus Modified Realism.Hervé Zwirn - 2020 - Foundations of Physics 50 (1):1-26.
    A large number of physicists now admit that quantum mechanics is a non-local theory. The EPR argument and the many experiments showing the violation of Bell’s inequalities seem to have confirmed convincingly that quantum mechanics cannot be local. Nevertheless, this conclusion can only be drawn inside a standard realist framework assuming an ontic interpretation of the wave function and viewing the collapse of the wave function as a real change of the physical state of the system. We show that this (...)
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  9. Nonlocality Versus Modified Realism.Hervé Zwirn - 2020 - Foundations of Physics 50 (1):1-26.
    A large number of physicists now admit that quantum mechanics is a non-local theory. The EPR argument and the many experiments showing the violation of Bell’s inequalities seem to have confirmed convincingly that quantum mechanics cannot be local. Nevertheless, this conclusion can only be drawn inside a standard realist framework assuming an ontic interpretation of the wave function and viewing the collapse of the wave function as a real change of the physical state of the system. We show that this (...)
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  10.  2
    Nonlocality Versus Modified Realism.Hervé Zwirn - 2020 - Foundations of Physics 50 (1):1-26.
    A large number of physicists now admit that quantum mechanics is a non-local theory. The EPR argument and the many experiments showing the violation of Bell’s inequalities seem to have confirmed convincingly that quantum mechanics cannot be local. Nevertheless, this conclusion can only be drawn inside a standard realist framework assuming an ontic interpretation of the wave function and viewing the collapse of the wave function as a real change of the physical state of the system. We show that this (...)
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