PIRSA:09110035 Scientific Series Quantum Gravity

DOI10.48660/09110035

Series: Quantum Gravity

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

Johnston, Steven. The Feynman propagator on a causal set.. Perimeter Institute, Nov. 13, 2009, https://pirsa.org/09110035 

@misc{ pirsa_PIRSA:09110035,
  doi = {10.48660/09110035},
  url = {https://pirsa.org/09110035},
  author = {Johnston, Steven},
  keywords = {Quantum Gravity},
  language = {en},
  title = {The Feynman propagator on a causal set.},
  publisher = {Perimeter Institute},
  year = {2009},
  month = {nov},
  note = {PIRSA:09110035 see, \url{https://pirsa.org}}
}

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.

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