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Stable cosmology in generalised massive gravity

Research output: Contribution to journalArticle

We present a thorough analysis of the cosmological perturbations in Generalised Massive Gravity. This is an extension of de Rham-Gabadadze-Tolley theory where the translation invariance in the Stückelberg field space is broken. This allows the mass parameters to be promoted to functions of the Stückelberg fields. We consider an exact cosmological background in this theory and study the stability of perturbations. We derive conditions to avoid ghost, gradient and tachyonic instability. The cosmology is an extension of the self-accelerating branch of the constant mass parameter theory, but now all five massive graviton polarisations propagate. For concreteness, we consider a minimal version of the theory where cosmology undergoes an accelerated expansion at late times and show that the perturbative stability is preserved for a range of parameters.
Original languageEnglish
Article number084014
Number of pages11
JournalPhysical Review D
Volume101
Issue number8
Early online date7 Apr 2020
DOIs
Publication statusPublished - 15 Apr 2020

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