Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2015/01/006
Keywords
modified gravity; dark energy theory
Funding
- David Gledhill Research Studentship, Sidney Sussex College, University of Cambridge
- Isaac Newton Fund and Studentships, University of Cambridge
- European Research Council (ERC) Starting Grant [StG2010-257080]
- Swedish Research Council
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We study the cosmic expansion history of massive bigravity with a viable matter coupling which treats both metrics on equal footing. We derive the Friedmann equation for the effective metric through which matter couples to the two metrics, and study its solutions. For certain parameter choices, the background cosmology is identical to that of ACDM. More general parameters yield dynamical dark energy, which can still be in agreement with observations of the expansion history. We study specific parameter choices of interest, including minimal models, maximally-symmetric models, and a candidate partially-massless theory.
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