PIRSA:17060100 Conference Cosmology

DOI10.48660/17060100

Conference/School: Bounce Scenarios in Cosmology

Lehners, J. (2017). Quantum cosmological instabilities - with and without boundaries. Perimeter Institute. https://pirsa.org/17060100

Lehners, Jean-Luc. Quantum cosmological instabilities - with and without boundaries. Perimeter Institute, Jun. 27, 2017, https://pirsa.org/17060100 

@misc{ pirsa_PIRSA:17060100,
  doi = {10.48660/17060100},
  url = {https://pirsa.org/17060100},
  author = {Lehners, Jean-Luc},
  keywords = {Cosmology},
  language = {en},
  title = {Quantum cosmological instabilities - with and without boundaries},
  publisher = {Perimeter Institute},
  year = {2017},
  month = {jun},
  note = {PIRSA:17060100 see, \url{https://pirsa.org}}
}

Abstract

The big bang singularity might be avoided by replacing it with a theory of initial conditions, or by considering a bounce from an earlier contracting phase. I will describe how both proposals can run into difficulties with instabilities when the spacetime must be treated semi-classically (i.e. when bounces occur due to a quantum tunneling transition rather than as classically non-singular solutions). The absence of such instabilities places new restrictions on the available theories, implying a selection criterion whose consequences remain to be explored.

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