Dynamics of Interacting Scalar Fields in Expanding Space-Time

Details Dynamics of Interacting Scalar Fields in Expanding Space-Time Dynamics of Interacting Scalar Fields in Expanding Space-Time

2004-06-30

arxiv.org/abs/hep-ph/0406339v2

Phys.Rev.D71:023513,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

36 pages, 12 figures. Version published in the Physical Review D

Scientific paper

10.1103/PhysRevD.71.023513

The effective equation of motion is derived for a scalar field interacting with other fields in a Friedman-Robertson-Walker background space-time. The dissipative behavior reflected in this effective evolution equation is studied both in simplified approximations as well as numerically. The relevance of our results to inflation are considered both in terms of the evolution of the inflaton field as well as its fluctuation spectrum. A brief examination also is made of supersymmetric models that yield dissipative effects during inflation.

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