PIRSA:15110095 Scientific Series Cosmology

DOI10.48660/15110095

Series: Cosmology and Gravitation

Bachlechner, T. (2015). Axionic Band Structure of the Cosmological Constant. Perimeter Institute. https://pirsa.org/15110095

Bachlechner, Thomas. Axionic Band Structure of the Cosmological Constant. Perimeter Institute, Nov. 19, 2015, https://pirsa.org/15110095 

@misc{ pirsa_PIRSA:15110095,
  doi = {10.48660/15110095},
  url = {https://pirsa.org/15110095},
  author = {Bachlechner, Thomas},
  keywords = {Cosmology},
  language = {en},
  title = { Axionic Band Structure of the Cosmological Constant},
  publisher = {Perimeter Institute},
  year = {2015},
  month = {nov},
  note = {PIRSA:15110095 see, \url{https://pirsa.org}}
}

Abstract

We argue that theories with multiple axions generically contain a large
number of vacua that can account for the smallness of the cosmological
constant. In a theory with N axions, the dominant instantons with charges Q
determine the discrete symmetry of vacua. Subleading instantons break the
leading periodicity and lift the vacuum degeneracy. For generic integer charges
the number of distinct vacua is given by |det(Q)|~exp(N). Our construction
motivates the existence of a landscape with a vast number of vacua in
four-dimensional effective theories.

Resources

Next talk

Related Talks