The stringy origins of Galileons and their novel limit

Damien Easson, Tucker Manton, Maulik Parikh, Andrew Svesko

Research output: Contribution to journalArticlepeer-review

Abstract

We show generalized Galileons - a particular subclass of Horndeski gravity - arise from a consistent Kaluza-Klein reduction of the low-energy effective action of heterotic string theory to first order in α'. This suggests Horndeski theories of gravity have a string-theoretic origin. The form of the Galileonic terms is precisely fixed by parameters of the embedding spacetime, so that only a specific subset of Horndeski theories is permitted by string theory. A novel limit of the model is considered by performing a dimensionfulrescaling of α'.

Original languageEnglish (US)
Article number031
JournalJournal of Cosmology and Astroparticle Physics
Volume2021
Issue number5
DOIs
StatePublished - May 2021
Externally publishedYes

Keywords

  • modified gravity
  • string theory and cosmology

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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