Abstract
We investigate the effects of bosonic trilinear interactions in preheating afterchaotic inflation. A trilinear interaction term allows for the complete decay ofthe massive inflaton particles, which is necessary for the transition to radiationdomination. We found that typically the trilinear term is subdominant during earlystages of preheating, but it actually amplifies parametric resonance driven bythe four-legs interaction. In cases where the trilinear term does dominate duringpreheating, the process occurs through periodic tachyonic amplifications withresonance effects, which is so effective that preheating completes within a fewinflaton oscillations. We develop an analytic theory of this process, which wecall tachyonic resonance. We also study numerically the influence of trilinearinteractions on the dynamics after preheating. The trilinear term eventually comes todominate after preheating, leading to faster rescattering and thermalization thancould occur without it. Finally, we investigate the role of non-renormalizableinteraction terms during preheating. We find that if they are present they generallydominate (while still in a controllable regime) in chaotic inflation models. Preheatingdue to these terms proceeds through a modified form of tachyonic resonance.
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