Delaying the waterfall transition in warm hybrid inflation

Mar Bastero-Gil; Arjun Berera; Thomas P. Metcalf; João G. Rosa

doi:10.1088/1475-7516/2014/03/023

Journal of Cosmology and Astroparticle Physics

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Delaying the waterfall transition in warm hybrid inflation

Mar Bastero-Gil^a, Arjun Berera^b, Thomas P. Metcalf^b and João G. Rosa^c

Published 13 March 2014 • Journal of Cosmology and Astroparticle Physics, Volume 2014, March 2014

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^a Departamento de Física Teórica y del Cosmos, Universidad de Granada, Granada, 18071 Spain

^b SUPA, School of Physics and Astronomy, University of Edinburgh, Mayfield Road, Edinburgh, EH9 3JZ United Kingdom

^c Departamento de Física da Universidade de Aveiro and I3N, Campus de Santiago, Aveiro, 3810-183 Portugal

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Received 1 February 2014
Accepted 26 February 2014
Published 13 March 2014

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Mar Bastero-Gil et al JCAP03(2014)023

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https://doi.org/10.1088/1475-7516/2014/03/023

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http://arxiv.org/abs/1312.2961

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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.

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