PIRSA:09070034 Conference Quantum Fields and Strings Particle Physics Cosmology

DOI10.48660/09070034

Conference/School: Holographic Cosmology Workshop - 2009

Albrecht, A. (2009). Challenges for a quantum theory of the universe. Perimeter Institute. https://pirsa.org/09070034

Albrecht, Andreas. Challenges for a quantum theory of the universe. Perimeter Institute, Jul. 18, 2009, https://pirsa.org/09070034 

@misc{ pirsa_PIRSA:09070034,
  doi = {10.48660/09070034},
  url = {https://pirsa.org/09070034},
  author = {Albrecht, Andreas},
  keywords = {Quantum Fields and Strings, Particle Physics, Cosmology},
  language = {en},
  title = {Challenges for a quantum theory of the universe},
  publisher = {Perimeter Institute},
  year = {2009},
  month = {jul},
  note = {PIRSA:09070034 see, \url{https://pirsa.org}}
}

Abstract

I review three challenges faced by attempts to develop a quantum theory of the universe and examine possible relationships between them. 1) The clock ambiguity: The choice of time parameter leads to profound ambiguities. 2) The choice of state: I contrast the de Sitter equilibrium picture with eternal inflation. 3) The Born rule crisis: The born rule is insufficient to construct probabilities in a large multiverse without additional rules or assumptions (as discussed by Don Page).

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