Cosmology of F(R) nonlinear massive gravity

Abstract

The theory of nonlinear massive gravity can be extended into the F(R) form as developed in Phys.Rev.D90, 064051 (2014). Being free of the Boulware-Deser ghost, such a construction has the additional advantage of exhibiting no linear instabilities around a cosmological background. We investigate various cosmological evolutions of a universe governed by this generalized massive gravitational theory. Specifically, under the Starobinsky ansantz, this model provides a unified description of the cosmological history, from early-time inflation to late-time self-acceleration. Moreover, under viable F(R) forms, the scenario leads to a very interesting dark-energy phenomenology, including the realization of the quintom scenario without any pathology. Finally, we provide a detailed analysis of the cosmological perturbations at linear order, as well as the Hamiltonian constraint analysis, in order to examine the physical degrees of freedom.

15 pages, 6 figures, version published in Phys. Rev. D

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