Generalized Chaplygin gas, accelerated expansion, and darkenergymatter unification
Abstract
We consider the scenario emerging from the dynamics of a generalized BornInfeld 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/ρ^{α}, 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.
 Publication:

Physical Review D
 Pub Date:
 August 2002
 DOI:
 10.1103/PhysRevD.66.043507
 arXiv:
 arXiv:grqc/0202064
 Bibcode:
 2002PhRvD..66d3507B
 Keywords:

 98.80.Cq;
 Particletheory and fieldtheory models of the early Universe;
 General Relativity and Quantum Cosmology
 EPrint:
 5 pages, 4 figures, revtex