Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2001-01-31
Phys.Lett. B506 (2001) 177-186
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
12 pages, uses amsart and amssymb. Minor corrections, to appear in Phys. Lett. B
Scientific paper
10.1016/S0370-2693(01)00414-2
The dynamical consequences of a bimetric scalar-tensor theory of gravity with a dynamical light speed are investigated in a cosmological setting. The model consists of a minimally-coupled self-gravitating scalar field coupled to ordinary matter fields in the standard way through the metric: $\metric_{\mu\nu}+B\partial_\mu\phi\partial_\nu\phi$. We show that in a universe with matter that has a radiation-dominated equation of state, the model allows solutions with a de Sitter phase that provides sufficient inflation to solve the horizon and flatness problems. This behaviour is achieved without the addition of a potential for the scalar field, and is shown to be largely independent of its introduction. We therefore have a model that is fundamentally different than the potential-dominated, slowly-rolling scalar field of the standard models inflationary cosmology. The speed of gravitational wave propagation is predicted to be significantly different from the speed of matter waves and photon propagation in the early universe.
Clayton Mike A.
Moffat John W.
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