Stringy Bubbles Solve de Sitter Troubles

Academic Article


  • Finding four-dimensional de Sitter spacetime solutions in string theory has been a vexing quest ever since the discovery of the accelerating expansion of the universe. Building on a recent analysis of bubble-nucleation in the decay of (false-vacuum) AdS backgrounds where the interfacing bubbles themselves exhibit a de Sitter geometry we show that this resonates strongly with a stringy cosmic brane construction that naturally provides for an exponential mass-hierarchy and the localization of both gravity and matter, in addition to an exponentially suppressed positive cosmological constant. Finally, we argue that these scenarios can be realized in terms of a generalization of a small resolution of a conifold singularity in the context of a (Lorentzian) Calabi–Yau 5-fold, where the isolated (Lorentzian) two complex dimensional Fano variety is a four-dimensional de Sitter spacetime.
  • Authors

  • Berglund, Per
  • Hubsch, Tristan
  • Minic, Djordje
  • Status

    Publication Date

  • October 2021
  • Published In

  • Universe  Journal
  • Keywords

  • Calabi-Yau
  • de Sitter
  • desingularization
  • string theory
  • Digital Object Identifier (doi)

    Start Page

  • 363
  • End Page

  • 363
  • Volume

  • 7
  • Issue

  • 10