PIRSA:19100043 Scientific Series Quantum Fields and Strings

DOI10.48660/19100043

Series: Quantum Fields and Strings

Mogni, C. (2019). Strings on the Keldysh Contour. Perimeter Institute. https://pirsa.org/19100043

Mogni, Christopher. Strings on the Keldysh Contour. Perimeter Institute, Oct. 15, 2019, https://pirsa.org/19100043 

@misc{ pirsa_PIRSA:19100043,
  doi = {10.48660/19100043},
  url = {https://pirsa.org/19100043},
  author = {Mogni, Christopher},
  keywords = {Quantum Fields and Strings},
  language = {en},
  title = {Strings on the Keldysh Contour},
  publisher = {Perimeter Institute},
  year = {2019},
  month = {oct},
  note = {PIRSA:19100043 see, \url{https://pirsa.org}}
}

Abstract

There is a fundamental tension between what string theory computes (S-matrix elements) and what you can compute in QFT on a time-dependent backgrounds (real time operator expectation values). The prescription for computing time dependent expectation values in QFT involves a path integral defined on a closed time path, known as the Keldysh contour. In this talk, we'll discuss how a worldsheet formulation of string theory must perceive the Keldysh contour and how this modifies critical string theory at tree level in the string coupling.

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