Cosmology and perturbations in massive gravity

Guido D'Amico

Cosmology and perturbations in massive gravity

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arxiv 1206.3617 v2 pith:EF33BXQR submitted 2012-06-16 hep-th astro-ph.COgr-qc

Guido D'Amico This is my paper · ORCID

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keywords perturbationsaroundmassivebackgroundgravityacquireanalysisbackgrounds

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We study perturbations around some cosmological backgrounds in the dRGT theory of massive gravity. We develop a general formalism to calculate the perturbations around any background. We derive the Lagrangian for fluctuations in the small scale limit, and for the open FRW solution we repeat the analysis around the full background. We find that the perturbations display similar properties: the longitudinal modes of the massive graviton are instantaneous at quadratic level, but they acquire a time-kinetic term at cubic order.

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To the Problem of Cosmic Expansion in Massive Gravity
gr-qc 2024-11 conditional novelty 6.0 of 10

All flat expanding cosmologies in dRGT massive gravity are strongly coupled at the perturbation level, so they cannot serve as healthy backgrounds for cosmic acceleration.

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