Mikael von Strauss, Angnis Schmidt-May, Jonas Enander, Edvard Mortsell, S. F. Hassan
We obtain the general cosmological evolution equations for a classically
consistent theory of bimetric gravity. These solutions are demonstrated to
generically allow for a cosmic evolution starting out from a matter dominated
FLRW universe while relaxing towards a de Sitter (anti-de Sitter) phase at late
cosmic time. In particular, we examine a subclass of models which contain
solutions that are able to reproduce the expansion history of the cosmic
concordance model inspite of the nonlinear couplings of the two metrics. This
is demonstrated explicitly by fitting these models to observational data from
Type Ia supernovae, Cosmic Microwave Background and Baryon Acoustic
Oscillations.
View original:
http://arxiv.org/abs/1111.1655
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