Feynman propagator for a free scalar field on a causal set.
The Feynman propagator for a free bosonic scalar field on the discrete spacetime of a causal set is presented. The formalism includes scalar field operators and a vacuum state which define a scalar quantum field theory on a causal set. This work can be viewed as a novel regularization of quantum field theory based on a Lorentz invariant discretization of spacetime.
Johnston
Steven
S
Theoretical Physics, Blackett Laboratory, Imperial College London, South Kensington, London, SW7 2AZ, United Kingdom. steven.johnston02@imperial.ac.uk