On the Suppression of Parametric Resonance and the Viability of Tachyonic Preheating after Multi-Field Inflation

Details On the Suppression of Parametric Resonance and the Viability of Tachyonic Preheating after Multi-Field Inflation On the Suppression of Parametric Resonance and the Viability of Tachyonic Preheating after Multi-Field Inflation

2009-04-17

arxiv.org/abs/0904.2778v2

Phys.Rev.D79:123510,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

v2: reference added, identical with PRD version, 23 pages, 3 figures

Scientific paper

10.1103/PhysRevD.79.123510

We investigate the feasibility of explosive particle production via parametric resonance or tachyonic preheating in multi-field inflationary models by means of lattice simulations. We observe a strong suppression of resonances in the presence of four-leg interactions between the inflaton fields and a scalar matter field, leading to insufficient preheating when more than two inflatons couple to the same matter field. This suppression is caused by a dephasing of the inflatons that increases the effective mass of the matter field. Including three-leg interactions leads to tachyonic preheating, which is not suppressed by an increase in the number of fields. If four-leg interactions are sub-dominant, we observe a slight enhancement of tachyonic preheating. Thus, in order for preheating after multi-field inflation to be efficient, one needs to ensure that three-leg interactions are present. If no tachyonic contributions exist, we expect the old theory of reheating to be applicable.

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