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Studies in History and Philosophy of Science Part B Studies in History and Philosophy of Modern Physics

A consistent quantum ontology

Robert B. Griffiths

Published Mar 22, 2013• 66 citations
Publisher
DOI
10.1016/j.shpsb.2012.12.002

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The core of my doctoral thesis consists in the establishment and evaluation of different ontological interpretations of quantum field theory. I thus seek for an ontological picture of the most fundamental level of the physical world, under the assumption that quantum field theory provides a true description. I defend the view that algebraic quantum field theory is the most important formulation when ontological questions are concerned. Some of my more extensive studies deal with different substance ontologies as well as with process-ontological approaches. Eventually, I propose a dispositional trope ontology, according to which particularized properties and not substances are the most basic entities, in terms of which all other entities are to be analysed.
The aim of this paper is to examine one of several candidates for the ontology of today’s most basic theory in physics, quantum field theory (QFT). I will begin by outlining some problems we encounter when we look at different conceptions for the basic entities to which QFT refers. The candidate ontology I wish to consider in this paper is process ontology. I shall characterize process ontology mainly in a negative manner as opposed to substance ontology. The central part will consist in a case study about how the interpretation of Feynman diagrams – the use of which is crucial in QFT – depends on whether we adhere to substance or process ontology. In conclusion I will evaluate my results and point towards some problems faced by process ontology as such.
Emergent quantum mechanics explores the possibility of an ontology for quantum mechanics. The resurgence of interest in "deeper-level" theories for quantum phenomena challenges the standard, textbook interpretation. The book presents expert views that critically evaluate the significance—for 21st century physics—of ontological quantum mechanics, an approach that David Bohm helped pioneer. The possibility of a deterministic quantum theory was first introduced with the original de Broglie-Bohm theory, which has also been developed as Bohmian mechanics. The wide range of perspectives that were contributed to this book on the occasion of David Bohm’s centennial celebration provide ample evidence for the physical consistency of ontological quantum mechanics. The book addresses deeper-level questions such as the following: Is reality intrinsically random or fundamentally interconnected? Is the universe local or nonlocal? Might a radically new conception of reality include a form of quantum causality or quantum ontology? What is the role of the experimenter agent? As the book demonstrates, the advancement of ‘quantum ontology’—as a scientific concept—marks a clear break with classical reality. The search for quantum reality entails unconventional causal structures and non-classical ontology, which can be fully consistent with the known record of quantum observations in the laboratory.