PIRSA:23070041 Conference Quantum Fields and Strings

DOI10.48660/23070041

Conference/School: Strings 2023

(2023). Research Talk 17 - Off Shell Strings and Black Hole Entropy. Perimeter Institute. https://pirsa.org/23070041

Research Talk 17 - Off Shell Strings and Black Hole Entropy. Perimeter Institute, Jul. 26, 2023, https://pirsa.org/23070041 

@misc{ pirsa_PIRSA:23070041,
  doi = {10.48660/23070041},
  url = {https://pirsa.org/23070041},
  author = {},
  keywords = {Quantum Fields and Strings},
  language = {en},
  title = {Research Talk 17 - Off Shell Strings and Black Hole Entropy},
  publisher = {Perimeter Institute},
  year = {2023},
  month = {jul},
  note = {PIRSA:23070041 see, \url{https://pirsa.org}}
}

Abstract

In order to derive the classical string action from the worldsheet, it is necessary to take string theory off shell. This can be done by a prescription of Tseytlin, who proposed taking the worldsheet sphere QFT partition function and *differentiating* it with the log of the UV cutoff. I will explain why this strange prescription always gives the correct answers, for both the S-matrix and equations of motion, to all orders in perturbation theory. I will also compare the Susskind-Uglum off-shell method of calculating black hole entropy, to the more popular (but also more dubious) orbifold method. Based on work with Amr Ahmadain (arXiv:2211.08607 and arXiv:2211.16448).

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