Comment on Healeys Quantum Theory and the Limits of Objectivity


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In this comment we critically review an argument against the existence of objective physical outcomes, recently proposed by R. Healey [Foundations of Physics, 48(11), 1568-1589]. We show that his gedankenexperiment, based on a combination of Wigners friend scenarios and Bells inequalities, suffers from the main criticism, that the computed correlation functions entering the Bells inequality are in principle experimentally inaccessible, and hence the authors claim is not verifiable. We discuss perspectives for fixing that by adapting the proposed protocol and show that this, however, makes Healeys argument virtually equivalent to other previous, similar proposals that he explicitly criticises.

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