Working directly with probabilities in quantum field theoryTools Dickinson, Robert, Forshaw, Jeff and Millington, Peter (2017) Working directly with probabilities in quantum field theory. Journal of Physics: Conference Series, 880 (1). 012041/1-012041/8. ISSN 1742-6596 Full text not available from this repository.
Official URL: https://doi.org/10.1088/1742-6596/880/1/012041
AbstractWe 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.
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