The fate of 'particles' in quantum field theories with interactions

Most philosophical discussion of the particle concept that is afforded by quantum field theory has focused on free systems. This paper is devoted to a systematic investigation of whether the particle concept for free systems can be extended to interacting systems. The possible methods of accomplishing this are considered and all are found unsatisfactory. Therefore, an interacting system cannot be interpreted in terms of particles. As a consequence, quantum field theory does not support the inclusion of particles in our ontology. In contrast to much of the recent discussion on the particle concept derived from quantum field theory, this argument does not rely on the assumption that a particulate entity be localizable.
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Richard Healey (2013). Physical Composition. Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 44 (1):48-62.
Steven French (2012). Unitary Inequivalence as a Problem for Structural Realism. Studies in History and Philosophy of Science Part B 43 (2):121-136.
David Baker (2009). Against Field Interpretations of Quantum Field Theory. British Journal for the Philosophy of Science 60 (3):585-609.
Ruth Kastner (2010). The Quantum Liar Experiment in Cramer's Transactional Interpretation. Studies in History and Philosophy of Science Part B 41 (2):86-92.

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