Delaying the waterfall transition in warm hybrid inflation

Abstract

We analyze the dynamics and observational predictions of supersymmetric hybrid inflation in the warm regime, where dissipative effects are mediated by the waterfall fields and their subsequent decay into light degrees of freedom. This produces a quasi-thermal radiation bath with a slowly-varying temperature during inflation and further damps the inflaton's motion, thus prolonging inflation. As in the standard supercooled scenario, inflation ends when the waterfall fields become tachyonic and can no longer sustain a nearly constant vacuum energy, but the interaction with the radiation bath makes the waterfall fields effectively heavier and delays the phase transition to the supersymmetric minimum. In this work, we analyze for the first time the effects of finite temperature corrections and SUSY mass splittings on the quantum effective potential and the resulting dissipation coefficient. We show, in particular, that dissipation can significantly delay the onset of the tachyonic instability to yield 50-60 e-folds of inflation and an observationally consistent primordial spectrum, which is not possible in the standard supercooled regime when inflation is driven by radiative corrections.

28 pages, 5 figures

References in corpus (11)

• Warm Inflation and its Microphysical Basis
• Power spectrum for inflation models with quantum and thermal noises
• Supersymmetric Hybrid Inflation with Non-Minimal Kahler potential
• Dynamics of oscillating scalar field in thermal environment
• Hybrid inflation along waterfall trajectories
• Supersymmetric And Smooth Hybrid Inflation In The Light Of WMAP3
• Dissipative Effects on Reheating after Inflation
• Anatomy of F_D-Term Hybrid Inflation
• Warm Inflection
• Kaehler Potentials for Hilltop F-term Hybrid Inflation
• The CJT calculation in studying nuclear matter beyond mean field approximation

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