1306.0004 (Yashar Akrami et al.)

Bimetric gravity doubly coupled to matter: theory and cosmological
implications    [PDF]

Yashar Akrami, Tomi S. Koivisto, David F. Mota, Marit Sandstad

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 naturally explain the cosmic acceleration without resorting to dark energy.

View original: http://arxiv.org/abs/1306.0004