Suppression of parametric resonance and the viability of tachyonic preheating after multifield inflation
- Helsinki Institute of Physics, P.O. Box 64, FIN-00014 Helsinki (Finland) and APC, UMR 7164, 10 rue Alice Domon et Leonie Duquet, 75205 Paris Cedex 13 (France)
We investigate the feasibility of explosive particle production via parametric resonance or tachyonic preheating in multifield 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 subdominant, we observe a slight enhancement of tachyonic preheating. Thus, in order for preheating after multifield 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.
- OSTI ID:
- 21300941
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 79, Issue 12; Other Information: DOI: 10.1103/PhysRevD.79.123510; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
Similar Records
Preheating after multifield inflation with nonminimal couplings. I. Covariant formalism and attractor behavior
Non-Gaussian and nonscale-invariant perturbations from tachyonic preheating in hybrid inflation