PIRSA:25060013 Conference Quantum Gravity

DOI10.48660/25060013

Conference/School: QIQG 2025

Marolf, D. (2025). Visions of RealTime: The Lorentz-signature gravitational path integral for fun and profit (Vision Talk). Perimeter Institute. https://pirsa.org/25060013

Marolf, Donald. Visions of RealTime: The Lorentz-signature gravitational path integral for fun and profit (Vision Talk). Perimeter Institute, Jun. 24, 2025, https://pirsa.org/25060013 

@misc{ pirsa_PIRSA:25060013,
  doi = {10.48660/25060013},
  url = {https://pirsa.org/25060013},
  author = {Marolf, Donald},
  keywords = {Quantum Gravity, Quantum Information},
  language = {en},
  title = {Visions of RealTime:  The Lorentz-signature gravitational path integral for fun and profit (Vision Talk)},
  publisher = {Perimeter Institute},
  year = {2025},
  month = {jun},
  note = {PIRSA:25060013 see, \url{https://pirsa.org}}
}

Abstract

The Euclidean gravitational action is unbounded below. As a result, even at the effective field theory level, the gravitational path integral cannot be formulated as an integral over real Euclidean geometries. I therefore review recent efforts to formulate the path integral directly in Lorentz-signature in a manner that allows general topology-changing transitions. I will also describe how this formulation resolves certain puzzles associated with computing the density of states for nearly-extremal black holes. (VIRTUAL TALK)

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