We consider the scenario emerging from the dynamics of a generalized Born-Infeld theory. The equation of state describing this system is given in terms of the energy density ρ and pressure p by the relationship p=-A/ρα, where A is a positive constant and 0<α<=1. We discuss the conditions under which homogeneity arises and show that this equation of state describes the evolution of a universe evolving from a phase dominated by nonrelativistic matter to a phase dominated by a cosmological constant via an intermediate period where the effective equation of state is given by p=αρ.
Physical Review D
- Pub Date:
- August 2002
- Particle-theory and field-theory models of the early Universe;
- General Relativity and Quantum Cosmology
- 5 pages, 4 figures, revtex