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Dynamical and observational constraints on the warm little inflaton scenario

Research output: Contribution to journalArticle

  • Mar Bastero-Gil
  • Arjun Berera
  • Rafael Hernandez-Jimenez
  • Joao G. Rosa

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Original languageEnglish
Article number083502
Number of pages15
JournalPhysical Review D
Volume98
Issue number8
DOIs
Publication statusPublished - 1 Oct 2018

Abstract

We explore the dynamics and observational predictions of the warm little inflaton scenario, presently the simplest realization of warm inflation within a concrete quantum field theory construction. We consider three distinct types of scalar potentials for the inflaton, namely chaotic inflation with a quartic monomial potential, a Higgs-like symmetry breaking potential and a non-renormalizable plateau-like potential. In each case, we determine the parametric regimes in which the dynamical evolution is consistent for 50-60 e-folds of inflation, taking into account thermal corrections to the scalar potential and requiring, in particular, that the two fennions coupled directly to the inflaton remain relativistic and close to thermal equilibrium throughout the slow-roll regime and that the temperature is always below the underlying gauge symmetry breaking scale. We then compute the properties of the primordial spectrum of scalar curvature perturbations and the tensor-to-scalar ratio in the allowed parametric regions and compare them with Planck data, showing that this scenario is theoretically and observationally successful for a broad range of parameter values.

    Research areas

  • QUANTUM-FIELD THEORY, INFLATIONARY UNIVERSE, SYMMETRY-BREAKING, PHASE-TRANSITION, EXPANSION, FLATNESS, DENSITY, HORIZON, MODELS

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  • Consequences of dissipative dynamics in the early universe

    Student thesis: Doctoral Thesis

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