Variable Speed of Light Cosmology and Bimetric Gravity:
Abstract
A scalartensor bimetric gravity model of early universe cosmology is reviewed. The metric frame with a variable speed of light (VSL) and a constant speed of gravitational waves is used to describe a FriedmannRobertsonWalker universe. The Friedmann equations are solved for a radiation dominated equation of state and the power spectrum is predicted to be scale invariant with a scalar mode spectral index n_{s}=0.97. The scalar modes are born in a ground state superhorizon and the fluctuation modes are causally connected by the VSL mechanism. The cosmological constant is equated to zero and there is no significant dependence on the scalar field potential energy. A possible way of distinguishing the bimetric gravity model from standard inflationary models is discussed.
 Publication:

International Journal of Modern Physics A
 Pub Date:
 2005
 DOI:
 10.1142/S0217751X05024031
 arXiv:
 arXiv:grqc/0404066
 Bibcode:
 2005IJMPA..20.1155M
 Keywords:

 General Relativity and Quantum Cosmology;
 Astrophysics;
 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 10 pages. Latex file. No figures. Talk given at the Coral Gables Conference on High Energy Physics and Cosmology, Fort Lauderdale, Florida, December 1721, 2003. Typos corrected. Reference added