Cosmic acceleration from string induced Galileons

Damien A. Easson, Tucker Manton, Andrew Svesko

Research output: Contribution to journalArticlepeer-review

Abstract

It has been shown a specific Horndeski theory of gravity arises from a consistent Kaluza-Klein reduction of the gravi-dilaton sector of the low-energy effective heterotic string action with a first α' correction. Here we provide a first investigation of the cosmological solutions to the lower dimensional theory by constructing exact solutions to the field equations in various frames. At tree level, in string frame, we find the duality symmetry of the parent theory is unaltered by dimensional reduction, leading to standard bouncing and pre-Big Bang scenario solutions. For α'≠0, we uncover exact models exhibiting cosmic acceleration, where we find interesting physics concerning the number of noncompact dimensions. Certain stability requirements demand the inclusion of a dilaton potential.

Original languageEnglish (US)
Article number076
JournalJournal of Cosmology and Astroparticle Physics
Volume2021
Issue number10
DOIs
StatePublished - Oct 2021

Keywords

  • cosmology with extra dimensions
  • dark energy theory
  • Gauss-Bonnet-Lovelock-Horndeski-Palatini etc gravity theories
  • inflation

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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