Vainshtein mechanism in Generalised Massive Gravity

A. Emir Gümrük üoǧlu, Rampei Kimura, Michael Kenna-Allison, Kazuya Koyama

Research output: Contribution to journalArticlepeer-review

Abstract

We present a non-linear analysis of perturbations around cosmological solutions in Generalised Massive gravity. This Lorentz invariant theory is an extension of de Rham, Gabadadze, Tolley massive gravity that propagates 5 degrees of freedom while allowing stable open FLRW cosmologies. For a minimal model that supports a self-accelerating background, we study the dynamics of non-linear perturbations. We find that the equation for the scalar graviton is distinct from the analogues in Horndeski and DHOST theories. We numerically solve the equation to find a new type of nonlinear solution for the scalar mode, and confirm the presence of a Vainshtein screening mechanism. We show that the PPN parameter approaches its GR value at solar system scales and satisfies the current bounds.

Original languageEnglish
Article number023
JournalJournal of Cosmology and Astroparticle Physics
Volume2021
Issue number9
DOIs
Publication statusPublished - 2021 Sep
Externally publishedYes

Keywords

  • dark energy theory
  • modified gravity

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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