Asymptotic behavior of the warm inflation scenario with viscous pressure

Details Asymptotic behavior of the warm inflation scenario with viscous pressure Asymptotic behavior of the warm inflation scenario with viscous pressure

2005-12-09

arxiv.org/abs/gr-qc/0512057v1

Phys.Rev. D73 (2006) 023502

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

31 pages, 2 figures, 3 tables. PACS numbers: 98.80Cq, 47.75+f

Scientific paper

10.1103/PhysRevD.73.023502

We analyze the dynamics of models of warm inflation with general dissipative effects. We consider phenomenological terms both for the inflaton decay rate and for viscous effects within matter. We provide a classification of the asymptotic behavior of these models and show that the existence of a late-time scaling regime depends not only on an asymptotic behavior of the scalar field potential, but also on an appropriate asymptotic behavior of the inflaton decay rate. There are scaling solutions whenever the latter evolves to become proportional to the Hubble rate of expansion regardless of the steepness of the scalar field exponential potential. We show from thermodynamic arguments that the scaling regime is associated to a power-law dependence of the matter-radiation temperature on the scale factor, which allows a mild variation of the temperature of the matter/radiation fluid. We also show that the late time contribution of the dissipative terms alleviates the depletion of matter, and increases the duration of inflation.

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