Dynamics of tachyonic preheating after hybrid inflation

Details Dynamics of tachyonic preheating after hybrid inflation Dynamics of tachyonic preheating after hybrid inflation

2002-02-05

arxiv.org/abs/hep-ph/0202031v2

Phys.Rev. D65 (2002) 103517

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 10 figures, REVTeX. Minor changes, some references added. To appear in PRD

Scientific paper

10.1103/PhysRevD.65.103517

We study the instability of a scalar field at the end of hybrid inflation, using both analytical techniques and numerical simulations. We improve previous studies by taking the inflaton field fully into account, and show that the range of unstable modes depends sensitively on the velocity of the inflaton field, and thereby on the Hubble rate, at the end of inflation. If topological defects are formed, their number density is determined by the shortest unstable wavelength. Finally, we show that the oscillations of the inflaton field amplify the inhomogeneities in the energy density, leading to local symmetry restoration and faster thermalization. We believe this explains why tachyonic preheating is so effective in transferring energy away from the inflaton zero mode.

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