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  1. Comment on Healey’s “Quantum Theory and the Limits of Objectivity”.Veronika Baumann, Flavio Del Santo & Časlav Brukner - 2019 - Foundations of Physics 49 (7):741-749.
    In this comment we critically review an argument against the existence of objective physical outcomes, recently proposed by Healey [1]. We show that his gedankenexperiment, based on a combination of “Wigner’s friend” scenarios and Bell’s inequalities, suffers from the main criticism, that the computed correlation functions entering the Bell’s inequality are in principle experimentally inaccessible, and hence the author’s claim is in principle not testable. We discuss perspectives for fixing that by adapting the proposed protocol and show that this, however, (...)
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  • Are there limits of objectivity in the quantum world?Shan Gao - unknown
    Healey recently argued that a version of the extended Wigner's friend Gedankenexperiment due to Masanes establishes a contradiction between the universal applicability of unitary quantum theory and the assumption of definite outcomes [Found. Phys. 48, 1568 ]. In this Comment, I show that Healey's analysis is problematic and his conclusion is not true.
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  • Quantum Reality, Perspectivalism and Covariance.Dennis Dieks - 2019 - Foundations of Physics 49 (6):629-646.
    Paul Busch has emphasized on various occasions the importance for physics of going beyond a merely instrumentalist view of quantum mechanics. Even if we cannot be sure that any particular realist interpretation describes the world as it actually is, the investigation of possible realist interpretations helps us to develop new physical ideas and better intuitions about the nature of physical objects at the micro level. In this spirit, Paul Busch himself pioneered the concept of “unsharp quantum reality”, according to which (...)
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  • Reply to a Comment on “Quantum Theory and the Limits of Objectivity”.Richard Healey - 2019 - Foundations of Physics 49 (8):816-819.
    In this short note I reply to criticisms of an argument in my paper that appear in comment. Baumann et al. raise one “main criticism” then go on to claim that the argument of Healey contains a series of problems. But their “main criticism” is not an objection to the argument and the problems are of their own making.
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