Dynamics of tachyonic preheating after hybrid inflation

Abstract

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.

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

References in corpus (8)

• Dynamics of Symmetry Breaking and Tachyonic Preheating
• Tachyonic Instability and Dynamics of Spontaneous Symmetry Breaking
• Hybrid Inflation and Baryogenesis at the TeV Scale
• Formation of topological defects in gauge field theories
• Electroweak preheating on a lattice
• False Vacuum Decay after Inflation
• Phase transition dynamics in the hot Abelian Higgs model
• Classical behaviour after a phase transition

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