http://arxiv.org/abs/1401.4418
The theory of nonlinear massive gravity can be extended into the F(R) form as developed in arXiv:1307.7150. 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 phantom-divide crossing 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.
Mon, 20 Jan 14
34/44
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