Exact self-accelerating cosmologies in the ghost-free bigravity and massive gravity

Abstract

Within the theory of the ghost-free bigravity, we present the most general cosmological solution for which the physical metric is homogeneous and isotropic, while the second metric is inhomogeneous. The solution includes a matter source and exists for any values of the theory parameters. The physical metric describes a universe with the late time acceleration due to the effective cosmological term mimicked by the graviton mass. When perturbed, this universe should rest approximately homogeneous and isotropic in space regions small compared to the graviton Compton length. In the limit where the massless graviton decouples, the solution fulfills the equations of the ghost-free massive gravity.

4 pages, derivation of the Stueckelberg fields corrected, references added

References in corpus (2)

• Resummation of Massive Gravity
• Interacting Spin-2 Fields

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