Efeitos de dissipação e flutuação no processo de ressonância paramétrica

Abstract

In this work, we investigate the effects of bosonic trilinear interactions in the process of resonant particle production after the inflationary phase. A trilinear interaction terms allow for the complete decay of the massive inflaton particles, which is necessary for the transition to radiation domination. We study a generic model for realistic inflation, motivated in particular by the warm inflation model, in which a scalar inflaton field ϕ can excite a heavy bosonic field χ which then decays into a light bosonic field σ. We study the consequencies of dissipation and stochastic noise terms in the field equations of motion, typical of warm inflation models, for the phenomenon of parametric resonance during preheating. a mechanism which is generic in realistic inflation models and which leads to robust warm inflation. This mechanism involves the We study the consequences of noise and dissipation for parametric resonance during preheating. The effective equations of motion for the inflaton and the radiation field are obtained and shown to present selfconsistent noise and dissipation terms. We found analytical solutions for these equations of motion. The equations exhibit the usual parametric resonance phenomenon, allowing for exponential amplification of the radiation modes inside the instability bands. We also study, numerically, the influence of fluctuations and dissipation on the dynamics during preheating with the trilinear interactions.