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Title: Delaying the waterfall transition in warm hybrid inflation

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.
Authors:
 [1] ; ;  [2] ;  [3]
  1. Departamento de Física Teórica y del Cosmos, Universidad de Granada, Granada, 18071 (Spain)
  2. SUPA, School of Physics and Astronomy, University of Edinburgh, Mayfield Road, Edinburgh, EH9 3JZ (United Kingdom)
  3. Departamento de Física da Universidade de Aveiro and I3N, Campus de Santiago, Aveiro, 3810-183 (Portugal)
Publication Date:
OSTI Identifier:
22370632
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DEGREES OF FREEDOM; INTERACTIONS; MASS; PHASE TRANSFORMATIONS; RADIATIVE CORRECTIONS; SPECTRA; SUPERSYMMETRY; TACHYONS; THERMAL RADIATION COSMOLOGICAL INFLATION