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Dinamics and particle production in the early universe

By: Tiago Charters de Azevedo
From: CFTC, Complexo Interdisciplinar
At: Complexo Interdisciplinar, anfiteatro
[2005-12-12] 11:30

We study a classical model of a massive inflaton field coupled to another scalar filed with a quartic interaction term. We use the theory developed by Kofman et al. to give a full description of the dynamics of the second field modes, including the behaviour of the phase, in terms of the iteration of a simple family of circle maps. The parameters of this family of maps are a function of time when expansion of the universe is taken into account. With this more detailed description, we obtain a systematic study of the efficiency of particle production as a function of the inflaton field and coupling parameters.