Cosmological solutions in bimetric gravity and their observational tests

Journal Article · Wed Feb 29 23:00:00 EST 2012 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2012/03/042· OSTI ID:22279768

Strauss, Mikael von; Schmidt-May, Angnis; Enander, Jonas; Mörtsell, Edvard

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 and 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. In the appendix we comment on the relation to massive gravity.

• OSTI ID: 22279768
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 03 Vol. 2012; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ANALYTICAL SOLUTION
ANTI DE SITTER GROUP
ANTI DE SITTER SPACE
BARYONS
COSMOLOGY
DE SITTER GROUP
DE SITTER SPACE
GRAVITATION
METRICS
NONLINEAR PROBLEMS
OSCILLATIONS
RELICT RADIATION
SUPERNOVAE
UNIVERSE