On Particles Creation and Renormalization in a Cosmological Model with a Big Rip

Details On Particles Creation and Renormalization in a Cosmological Model with a Big Rip On Particles Creation and Renormalization in a Cosmological Model with a Big Rip

2009-11-19

arxiv.org/abs/0911.3737v1

Grav.Cosmol.15:341-344,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, 2 figures

Scientific paper

10.1134/S0202289309040094

An exact solution is obtained for a massive scalar field conformally coupled with the curvature in a cosmological model with the scale factor $a(t) = a_0 / |t|$, corresponding to background matter with the equation of state $ p = - 5 \varepsilon /3 $. An expression for the number density of created particles is obtained, and its behavior is studies as the model approached the instant of a Big Rip. Renormalization of the energy-momentum tensor is considered, and it is shown that back reaction of the quantum effects of a conformally coupled scalar field on the space-time metric can be neglected if the field mass is much smaller than the Planck mass and if the time left to the Big Rip is greater than the Planck time.

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