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Galileons coupled to massive gravity: general analysis and cosmological solutions

Research output: Contribution to journalArticle

We further develop the framework for coupling galileons and Dirac-Born-Infeld (DBI) scalar fields to a massive graviton while retaining both the non-linear symmetries of the scalars and ghost-freedom of the theory. The general construction is recast in terms of vielbeins which simplifies calculations and allows for compact expressions. Expressions for the general form of the action are derived, with special emphasis on those models which descend from maximally symmetric spaces. We demonstrate the existence of maximally symmetric solutions to the fully non-linear theory and analyze their spectrum of quadratic fluctuations. Finally, we consider self-accelerating cosmological solutions and study their perturbations, showing that the vector and scalar modes have vanishing kinetic terms.

Original languageEnglish
Article number008
JournalJournal of Cosmology and Astroparticle Physics
Volume2014
Issue number8
DOIs
Publication statusPublished - 4 Aug 2014
Externally publishedYes

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