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On the Classification Between $$psi$$ ψ -Ontic and $$psi$$ ψ -Epistemic Ontological Models

Andrea Oldofredi & Cristian López

Foundations of Physics 50 (11):1315-1345 (2020)

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On the Reality of the Quantum State Once Again: A No-Go Theorem for ψ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\psi$$\end{document}-Ontic Models. [REVIEW]Christine A. Aidala, Andrea Oldofredi & Gabriele Carcassi - 2024 - Foundations of Physics 54 (1):1-15.details In this paper we show that ψ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\psi$$\end{document}-ontic models, as defined by Harrigan and Spekkens (HS), cannot reproduce quantum theory. Instead of focusing on probability, we use information theoretic considerations to show that all pure states of ψ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\psi$$\end{document}-ontic models must be orthogonal to each other, in clear violation of quantum mechanics. Given that (i) Pusey, Barrett and Rudolph (PBR) previously showed that ψ\documentclass[12pt]{minimal} \usepackage{amsmath} (...) Download Export citation Bookmark 2 citations
Can the Ontology of Bohmian Mechanics Consists Only in Particles? The PBR Theorem Says No.Shan Gao - 2023 - Foundations of Physics 53 (6):1-21.details The meaning of the wave function is an important unresolved issue in Bohmian mechanics. On the one hand, according to the nomological view, the wave function of the universe or the universal wave function is nomological, like a law of nature. On the other hand, the PBR theorem proves that the wave function in quantum mechanics or the effective wave function in Bohmian mechanics is ontic, representing the ontic state of a physical system in the universe. It is usually thought (...) Download Export citation Bookmark 2 citations
The information-theoretic view of quantum mechanics and the measurement problem(s).Federico Laudisa - 2023 - European Journal for Philosophy of Science 13 (2):1-26.details Until recently Jeffrey Bub and Itamar Pitowsky, in the framework of an information-theoretic view of quantum mechanics, claimed first that to the measurement problem in its ordinary formulation there correspond in effect two measurement problems (simply called the big and the small measurement problems), with a different degree of relevance and, second, that the analysis of a quantum measurement is a problem only if other assumptions – taken by Pitowsky and Bub to be unnecessary ‘dogmas’ – are assumed. Here I (...) Download Export citation Bookmark
Is the Statistical Interpretation of Quantum Mechanics ψ-Ontic or ψ-Epistemic?Mario Hubert - 2023 - Foundations of Physics 53 (16):1-23.details The ontological models framework distinguishes ψ-ontic from ψ-epistemic wave- functions. It is, in general, quite straightforward to categorize the wave-function of a certain quantum theory. Nevertheless, there has been a debate about the ontological status of the wave-function in the statistical interpretation of quantum mechanics: is it ψ-epistemic and incomplete or ψ-ontic and complete? I will argue that the wave- function in this interpretation is best regarded as ψ-ontic and incomplete. Download Export citation Bookmark 1 citation
States vs. Changes of States: A Reformulation of the Ontic vs. Epistemic Distinction in Quantum Mechanics.Joanna Luc - 2022 - Foundations of Physics 53 (1):1-35.details In this paper, I challenge the distinction between “epistemic” and “ontic” states propounded by Harrigan and Spekkens (Found Phys 40:125–157, 2010) by pointing out that because knowledge is factive, any state that represents someone’s knowledge about a physical system thereby also represents something about the physical system itself, so there is no such thing as “mere knowledge”. This criticism leads to the reformulation of the main question of the debate: instead of asking whether a given state is ontic or epistemic, (...) Download Export citation Bookmark 2 citations
How Real are Quantum States in ψ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\psi$$\end{document}-Ontic Models? [REVIEW]R. Hermens - 2021 - Foundations of Physics 51 (2):1-26.details There is a longstanding debate on the metaphysical relation between quantum states and the systems they describe. A series of relatively recent ψ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\psi$$\end{document}-ontology theorems have been taken to show that, provided one accepts certain assumptions, “quantum states are real”. In this paper I investigate the question of what that claim might be taken to mean in light of these theorems. It is argued that, even if one accepts the framework and assumptions (...) Download Export citation Bookmark 2 citations
Relational Quantum Mechanics and the PBR Theorem: A Peaceful Coexistence.Andrea Oldofredi & Claudio Calosi - 2021 - Foundations of Physics 51 (4):1-21.details According to Relational Quantum Mechanics the wave function \ is considered neither a concrete physical item evolving in spacetime, nor an object representing the absolute state of a certain quantum system. In this interpretative framework, \ is defined as a computational device encoding observers’ information; hence, RQM offers a somewhat epistemic view of the wave function. This perspective seems to be at odds with the PBR theorem, a formal result excluding that wave functions represent knowledge of an underlying reality described (...) Download Export citation Bookmark 6 citations

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