Cosmological solutions in bimetric gravity and their observational tests
2012 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, no 3, 042- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2012. no 3, 042- p.
modified gravity, dark energy theory
Astronomy, Astrophysics and Cosmology
Research subject Theoretical Physics
IdentifiersURN: urn:nbn:se:su:diva-83245DOI: 10.1088/1475-7516/2012/03/042ISI: 000302949600042OAI: oai:DiVA.org:su-83245DiVA: diva2:574777