Out-of-equilibrium evolution of quantum fields in the hybrid model with quantum back reaction

Jürgen Baacke and Andreas Heinen
Phys. Rev. D 69, 083523 – Published 28 April 2004
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Abstract

The hybrid model with a scalar “inflaton” field coupled to a “Higgs” field with a broken symmetry potential is one of the promising models for inflation and (p)reheating after inflation. We consider the nonequilibrium evolution of the quantum fields of this model with quantum back reaction in the Hartree approximation, in particular the transition of the Higgs field from the metastable “false vacuum” to the broken symmetry phase. We have performed the renormalization of the equations of motion, of the gap equations, and of the energy density, using dimensional regularization. We study the influence of the back reaction on the evolution of the classical fields and of the quantum fluctuations. We observe that back reaction plays an important role over a wide range of parameters. Some implications of our investigation for the preheating stage after cosmic inflation are presented.

  • Received 27 November 2003

DOI:https://doi.org/10.1103/PhysRevD.69.083523

©2004 American Physical Society

Authors & Affiliations

Jürgen Baacke* and Andreas Heinen

  • Institut für Physik, Universität Dortmund, D-44221 Dortmund, Germany

  • *Electronic address: baacke@physik.uni-dortmund.de
  • Electronic address: andreas.heinen@uni-dortmund.de

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Issue

Vol. 69, Iss. 8 — 15 April 2004

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