Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2011-11-07
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
Latex, 26 pages. References added and minor revision of introduction and appendix B
Scientific paper
We obtain the general cosmological evolution equations for a classically consistent theory of bimetric gravity. Their analytic 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.
Enander Jonas
Hassan S. F.
M"ortsell Edvard
Schmidt-May Angnis
Strauss Mikael von
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