Exact solutions for the interacting tachyonic-dark matter system

Abstract

We find exact solutions leading to power law accelerated expansion for a homogeneous, isotropic and spatially flat universe, dominated by an interacting mixture of cold dark matter and a tachyonic field such that the ratio of the energy densities of both components at late times is constant and no coincidence problem arises.

Comments: 11 pages, no figues, to be published in Gen. Ralativ. Grav