Particle Production in an expanding universe dominated by dark energy fluid

Details Particle Production in an expanding universe dominated by dark energy fluid Particle Production in an expanding universe dominated by dark energy fluid

2007-10-04

arxiv.org/abs/0710.0999v1

Grav.Cosmol.14:140-146,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Latex file, 14 pages, 1 figure in EPS format

Scientific paper

10.1134/S0202289308020035

We investigate the fate of particle production in an expanding universe dominated by a perfect fluid with equation of state $p = \alpha\rho$. The rate of particle production, using the Bogolioubov coefficients, are determined exactly for any value of $\alpha$ in the case of a flat universe. When the strong energy condition is satisfied, the rate of particle production decreases as time goes on, in agreement to the fact that the four-dimensional curvature decreases with the expansion; the opposite occurs when the strong energy condition is violated. In the phantomic case, the rate of particle production diverges in a finite time. This may lead to a backreaction effect, leading to the avoidance of the big rip singularity, specially if $- 1 > \alpha > - {5/3}$.

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