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PIRSA:09110035

The Feynman propagator on a causal set.

APA

Johnston, S. (2009). The Feynman propagator on a causal set.. Perimeter Institute for Theoretical Physics. https://pirsa.org/09110035

Steven Johnston Imperial College London

Talk numberPIRSA:09110035
Source RepositoryPIRSA
Collection

Abstract

How sure are you that spacetime is continuous? One approach to quantum gravity, causal set theory, models spacetime as a discrete structure: a causal set. This talk begins with a brief introduction to causal sets, then describes a new approach to modelling a quantum scalar field on a causal set. We obtain the Feynman propagator for the field by a novel procedure starting with the Pauli-Jordan commutation function. The candidate Feynman propagator is shown to agree with the continuum result. This model opens the door to physical predictions for scalar matter on a causal set.