Thermal effects on slow-roll dynamics

Details Thermal effects on slow-roll dynamics Thermal effects on slow-roll dynamics

2007-12-07

arxiv.org/abs/0712.1120v2

Phys.Rev.D77:123521,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, 11 eps figures. v2: paper reorganized, title changed, conclusions unchanged, to appear in PRD

Scientific paper

10.1103/PhysRevD.77.123521

A description of the transition from the inflationary epoch to radiation domination requires the understanding of quantum fields out of thermal equilibrium, particle creation and thermalisation. This can be studied from first principles by solving a set of truncated real-time Schwinger-Dyson equations, written in terms of the mean field (inflaton) and the field propagators, derived from the two-particle irreducible effective action. We investigate some aspects of this problem by considering the dynamics of a slow-rolling mean field coupled to a second quantum field, using a \phi^2\chi^2 interaction. We focus on thermal effects. It is found that interactions lead to an earlier end of slow-roll and that the evolution afterwards depends on details of the heatbath.

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