Dynamical Mechanism for Varying Light Velocity as a Solution to Cosmological Problems

M. A. Clayton; J. W. Moffat

doi:10.1016/S0370-2693(99)00774-1

paper

Dynamical Mechanism for Varying Light Velocity as a Solution to Cosmological Problems

arXiv:astro-ph/9812481 · doi:10.1016/S0370-2693(99)00774-1

Abstract

A dynamical model for varying light velocity in cosmology is developed, based on the idea that there are two metrics in spacetime. One metric $g_{μν}$ describes the standard gravitational vacuum, and the other $g^_{μν} = g_{μν} + β ψ_{μ} ψ_{ν}$ describes the geometry through which matter fields propagate. Matter propagating causally with respect to $g^_{μν}$ can provide acausal contributions to the matter stress-energy tensor in the field equations for $g_{μν}$ , which, as we explicitly demonstrate with perfect fluid and scalar field matter models, provides a mechanism for the solution of the horizon, flatness and magnetic monopole problems in an FRW universe. The field equations also provide a ``graceful exit'' to the inflationary epoch since below an energy scale (related to the mass of $ψ_{μ}$ ) we recover exactly the standard FRW field equations.

15 pages, no figures, misprint corrections. Accepted for publication in Physics Letters B

Dynamical Mechanism for Varying Light Velocity as a Solution to Cosmological Problems

Abstract

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