Preheating of Nonminimally Coupled Scalar Fields

Details Preheating of Nonminimally Coupled Scalar Fields Preheating of Nonminimally Coupled Scalar Fields

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nmgm.meet.2005t&link_type=abstract

"THE NINTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation and R

Physics

Scientific paper

We study preheating after inflation with nonminimally coupled scalar fields in two different models. One is the chaotic inflationary scenario in the presence of a scalar field χ coupled to a spacetime curvature R (1/2ξRχ2) as well as to the inflaton ɸ (1/2g2ɸ2χ2). While the χ particle production can be assisted by nonminimal coupling for small g, we typically require rather large coupling ξ greater than unity for an efficient resonance. On the other hand, in the higher-curvature inflationary model with a nonminimally coupled scalar field, the particle production is found to be strong even if ξ is of order unity. This is due to the fact that the scalar curvature in the higher-curvature model decreases slower relative to the massive inflationary scenario.

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