Physics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ijtp...38.1299r&link_type=abstract
International Journal of Theoretical Physics, Vol. 38, No. 4, p. 1299 - 1314
Physics
Cosmology: Inflationary Universe
Scientific paper
The author summarizes a study (with B. L. Hu (1997)) of the nonequilibrium dynamics of an unbroken-symmetry inflation field during postinflationary reheating, during which the energy density contained in the expectation value of the inflation field is rapidly transferred to inhomogeneous quantum modes of the inflation field. The coupled dynamics of the expectation value (mean field) of a scalar inflation field with an unbroken global O(N) symmetry and its quantum variance is studied using the leading-order, large-N approximation in a spatially flat Friedmann-Robertson-Walker (FRW) background spacetime. The initial conditions for the mean field, variance, and Hubble parameter were chosen to be consistent with conditions at the end of slow roll in chaotic inflation. Backreaction of the dynamics of the mean field on the spacetime is incorporated self-consistently using the semiclassical Einstein equation. The coupled dynamical equations for the mean field, variance, and scale factor are solved for various choices of the mean field amplitude at the end of the slow-roll period, in order to determine the effect of spacetime curvature on "preheating", the parametric resonance-induced, rapid transfer of energy from the mean field to the inhomogeneous inflation modes. It is shown that cosmic expansion can dramatically effect the efficiency of preheating in the particular model studied.
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