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Area of Science:

  • Theoretical Physics
  • Cosmology
  • String Theory

Background:

  • Cosmological acceleration is challenging for supergravity and superstring theories.
  • Localized acceleration in de Sitter-like black hole interiors offers an alternative.
  • Global anti-de Sitter backgrounds can enhance de Sitter bubble formation.

Purpose of the Study:

  • To investigate the formation of localized accelerating regions within a global anti-de Sitter background.
  • To explore the potential for generating multiple accelerating universes from anti-de Sitter fluctuations.
  • To strengthen the scenario of non-universal cosmological acceleration.

Main Methods:

  • Utilizing mechanisms analogous to the Bizoń-Rostworowski instability.
  • Performing explicit numerical simulations.
  • Employing a two-dimensional dilaton-gravity model.

Main Results:

  • The formation of de Sitter bubbles is enhanced in an anti-de Sitter background.
  • The Bizoń-Rostworowski instability analogue facilitates collapse.
  • Numerical work confirms collapse enhancement in the model.

Conclusions:

  • The anti-de Sitter background provides a viable framework for localized cosmological acceleration.
  • This mechanism offers a pathway to producing multiple accelerating universes.
  • The findings support theories admitting regular black holes with de Sitter interiors.