Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-08-31
Astronomy and Astrophysics
Astrophysics
Latex file, expanded (+50%) and improved version, eight pages and thirteen .ps figures. To appear in the Proceedings of the Pa
Scientific paper
Recent progress in the preheating phenomena for inflationary cosmology is reviewed. We first discuss estimates of the preheating time scale and particle production at the early stages of parametric amplification within the Mathieu and Lam'e approximations and we analyze their precision and limitations. The necessity of self-consistent calculations including the non-linearity of the field theory equations in an energy conserving scheme is stressed. The large N calculations including the field back-reaction are reviewed. For spontaneously broken theories the issue of symmetry restoration is analyzed. A discussion of the possibility and criterion for symmetry restoration is presented.
Boyanovsky Daniel
de Vega Hector J.
Holman Richard
Salgado Julien F. J.
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