PIRSA:09070034

Challenges for a quantum theory of the universe

APA

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

MLA

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

BibTex

          @misc{ pirsa_09070034,
            doi = {},
            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).