Working directly with probabilities in quantum field theory

R. Dickinson, J. Forshaw, P. Millington

    Research output: Contribution to journalConference articlepeer-review

    Abstract

    We present a novel approach to computing transition probabilities in quantum field theory, which allows them to be written directly in terms of expectation values of nested commutators and anti-commutators of field operators, rather than squared matrix elements. We show that this leads to a diagrammatic expansion in which the retarded propagator plays a dominant role. As a result, one is able to see clearly how faster-than-light signalling is prevented between sources and detectors. Finally, we comment on potential implications of this approach for dealing with infra-red divergences.

    Original languageEnglish
    Article number012041
    JournalJournal of Physics: Conference Series
    Volume880
    Issue number1
    Early online date18 Aug 2017
    DOIs
    Publication statusPublished - 2018
    Event8th International Workshop on Decoherence, Information, Complexity and Entropy, DICE 2016 - Castiglioncello, Italy
    Duration: 12 Sep 201616 Sep 2016

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