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Exact solutions for the interacting tachyonic-dark matter system

Ramon Herrera, Diego Pavon, Winfried Zimdahl

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.

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.

Paper Structure

This paper contains 6 sections, 30 equations.

Table of Contents

  1. Introduction
  2. Basic tachyon field equations
  3. The $\varphi$CDM interacting model
  4. $\dot{\varphi}^2 = {\rm const}$
  5. $\dot{\varphi}^2 \neq {\rm const}$
  6. Concluding remarks