Stringy realization of a small and positive cosmological constant in dark bubble cosmology

Nov 18, 2022
20 pages
Published in:
  • Phys.Rev.D 107 (2023) 2, 026020
  • Published: Jan 15, 2023
e-Print:
DOI:
Report number:
  • UUITP - 49/22,
  • HIP-2022-29/TH

Citations per year

20222023202436
Abstract: (APS)
In this paper we construct a stringy embedding of the dark bubble model of an expanding 4D cosmology with the help of branes rotating in extra dimensions. The Universe rides a bubble which has nucleated in an unstable higher dimensional background. Our construction is therefore a string theoretical realization of Vilenkin’s quantum cosmology. While the cosmological constant vanishes at lowest order, loop corrections predicted by the weak gravity conjecture can induce a phenomenologically viable value. The model predicts the existence of large extra dimensions compatible with observational constraints, and we note a possible connection with the dark dimension proposal.
Note:
  • 20 pages, 4 figures
  • membrane model: rotation
  • higher-dimensional
  • bubble
  • string
  • cosmological constant
  • cosmological model
  • string model
  • background
  • quantum cosmology
  • embedding