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2012

Perturbations in Massive Gravity Cosmology

Crisostomi, Marco, Comelli, Denis, Pilo, Luigi

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We study cosmological perturbations for a ghost free massive gravity theory formulated with a dynamical extra metric that is needed to massive deform GR.

In this formulation FRW background solutions fall in two branches.
In the dynamics of perturbations around the first branch solutions, no extra degree of freedom with respect to GR ispresent at linearized level, likewise what is found in the Stuckelberg formulation of massive gravity where the extra metric isflat and non dynamical.
In the first branch, perturbations are probably strongly coupled.

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