PIRSA:25060028 Conference Quantum Gravity

DOI10.48660/25060028

Conference/School: QIQG 2025

Engelhardt, N. (2025). Baby Universes and Holography: the Case of the Vanishing Universe. Perimeter Institute. https://pirsa.org/25060028

Engelhardt, Netta. Baby Universes and Holography: the Case of the Vanishing Universe. Perimeter Institute, Jun. 27, 2025, https://pirsa.org/25060028 

@misc{ pirsa_PIRSA:25060028,
  doi = {10.48660/25060028},
  url = {https://pirsa.org/25060028},
  author = {Engelhardt, Netta},
  keywords = {Quantum Gravity, Quantum Information},
  language = {en},
  title = {Baby Universes and Holography: the Case of the Vanishing Universe},
  publisher = {Perimeter Institute},
  year = {2025},
  month = {jun},
  note = {PIRSA:25060028 see, \url{https://pirsa.org}}
}

Abstract

A number of recent arguments have suggested that baby universes in quantum gravity have a one-dimensional Hilbert space. I will provide a new argument, based on work with E. Gesteau, in favor of this conclusion. The argument makes use of a standard asymptotically AdS spacetime dual to a thermal state below the Hawking-Page transition. In particular, there is a low-energy, low-complexity causal wedge operator whose expectation value in the dual CFT is only consistent with a one-dimensional Hilbert space for baby universes.

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