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Feynman Propagator for a Free Scalar Field on a Causal Set

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PHYSICAL REVIEW LETTERS
卷 103, 期 18, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.180401

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  1. STFC
  2. Perimeter Institute for Theoretical Physics

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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.

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