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Thermal effects on slow-roll dynamics Gert Aarts*
 

Summary: Thermal effects on slow-roll dynamics
Gert Aarts*
Department of Physics, Swansea University, Singleton Park, Swansea, SA2 8PP, United Kingdom
Anders Tranberg+
DAMTP, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, United Kingdom
and Department of Physics, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland
(Received 12 December 2007; published 16 June 2008)
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 thermalization. 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 '2
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.
DOI: 10.1103/PhysRevD.77.123521 PACS numbers: 98.80.Cq, 11.10.Wx
I. INTRODUCTION
Cosmological observations strongly suggest that a stage

  

Source: Aarts, Gert - Department of Physics, University of Wales Swansea

 

Collections: Physics