Bimetric gravity doubly coupled to matter: theory and cosmological implications

Abstract

A ghost-free theory of gravity with two dynamical metrics both coupled to matter is shown to be consistent and viable. Its cosmological implications are studied, and the models, in particular in the context of partially massless gravity, are found to explain the cosmic acceleration without resorting to dark energy.

25 pages, no figures; typos corrected; references added; some discussions added in response to referee's comments; matches version accepted for publication in JCAP

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