PIRSA:19110107 Conference Cosmology

DOI10.48660/19110107

Conference/School: Emmy Noether Workshop: The Structure of Quantum Space Time

Carlip, S. (2019). Spacetime Foam and the Cosmological Constant. Perimeter Institute. https://pirsa.org/19110107

Carlip, Steve. Spacetime Foam and the Cosmological Constant. Perimeter Institute, Nov. 21, 2019, https://pirsa.org/19110107 

@misc{ pirsa_PIRSA:19110107,
  doi = {10.48660/19110107},
  url = {https://pirsa.org/19110107},
  author = {Carlip, Steve},
  keywords = {Cosmology, Quantum Fields and Strings, Quantum Gravity},
  language = {en},
  title = {Spacetime Foam and the Cosmological Constant},
  publisher = {Perimeter Institute},
  year = {2019},
  month = {nov},
  note = {PIRSA:19110107 see, \url{https://pirsa.org}}
}

Abstract

I describe a radical proposal for the cosmological constant problem: perhaps Lambda really is very large, but is "hidden" in Planck-scale fluctuations of geometry and topology. I show that an enormous set of initial data describe a universe with such a hidden cosmological constant at an initial time. The question of whether this structure is preserved under time evolution is still open, but I provide some evidence that it may be. I close with a discussion of open questions that might lead to further insight (or perhaps kill the idea).

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