Preheating with Trilinear Interactions: Tachyonic Resonance
| Autor: | Jean-François Dufaux, Gary N. Felder, Lev Kofman, Marco Peloso, Dmitry I. Podolsky |
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| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
Inflation
Physics of the early universe High Energy Physics - Theory Particle physics FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences Resonance (particle physics) High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences 010306 general physics Eternal inflation Physics 010308 nuclear & particles physics Astrophysics (astro-ph) High Energy Physics::Phenomenology Astronomy and Astrophysics Inflaton 3. Good health Term (time) High Energy Physics - Phenomenology Thermalisation High Energy Physics - Theory (hep-th) Quantum electrodynamics Parametric oscillator |
| Popis: | We investigate the effects of bosonic trilinear interactions in preheating after chaotic inflation. A trilinear interaction term allows for the complete decay of the massive inflaton particles, which is necessary for the transition to radiation domination. We found that typically the trilinear term is subdominant during early stages of preheating, but it actually amplifies parametric resonance driven by the four-legs interaction. In cases where the trilinear term does dominate during preheating, the process occurs through periodic tachyonic amplifications with resonance effects, which is so effective that preheating completes within a few inflaton oscillations. We develop an analytic theory of this process, which we call tachyonic resonance. We also study numerically the influence of trilinear interactions on the dynamics after preheating. The trilinear term eventually comes to dominate after preheating, leading to faster rescattering and thermalization than could occur without it. Finally, we investigate the role of non-renormalizable interaction terms during preheating. We find that if they are present they generally dominate (while still in a controllable regime) in chaotic inflation models. Preheating due to these terms proceeds through a modified form of tachyonic resonance. 19 pages, 10 figures, refs added, published version |
| Databáze: | OpenAIRE |
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