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Title: Exploring the parameter space of warm-inflation models

Abstract

Warm inflation includes inflaton interactions with other fields throughout the inflationary epoch instead of confining such interactions to a distinct reheating era. Previous investigations have shown that, when certain constraints on the dynamics of these interactions and the resultant radiation bath are satisfied, a low-momentum-dominated dissipation coefficient ∝T{sup 3}/m{sub χ}{sup 2} can sustain an era of inflation compatible with CMB observations. In this work, we extend these analyses by including the pole-dominated dissipation term ∝√(m{sub χ}T)exp (−m{sub χ}/T). We find that, with this enhanced dissipation, certain models, notably the quadratic hilltop potential, perform significantly better. Specifically, we can achieve 50 e-folds of inflation and a spectral index compatible with Planck data while requiring fewer mediator field (O(10{sup 4}) for the quadratic hilltop potential) and smaller coupling constants, opening up interesting model-building possibilities. We also highlight the significance of the specific parametric dependence of the dissipative coefficient which could prove useful in even greater reduction in field content.

Authors:
 [1]; ;  [2]
  1. Departamento de Física Teórica y del Cosmos, Universidad de Granada,Granada-18071 (Spain)
  2. SUPA, School of Physics and Astronomy, University of Edinburgh,Edinburgh, EH9 3JZ (United Kingdom)
Publication Date:
Sponsoring Org.:
SCOAP3, CERN, Geneva (Switzerland)
OSTI Identifier:
22458417
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 12; Other Information: PUBLISHER-ID: JCAP12(2015)046; OAI: oai:repo.scoap3.org:13170; Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COSMOLOGICAL INFLATION; COSMOLOGY; COUPLING CONSTANTS; INTERACTIONS; LIMITING VALUES; MATHEMATICAL SPACE; POTENTIALS; RELICT RADIATION

Citation Formats

Bastero-Gil, Mar, Berera, Arjun, and Kronberg, Nico. Exploring the parameter space of warm-inflation models. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/12/046.
Bastero-Gil, Mar, Berera, Arjun, & Kronberg, Nico. Exploring the parameter space of warm-inflation models. United States. doi:10.1088/1475-7516/2015/12/046.
Bastero-Gil, Mar, Berera, Arjun, and Kronberg, Nico. Tue . "Exploring the parameter space of warm-inflation models". United States. doi:10.1088/1475-7516/2015/12/046.
@article{osti_22458417,
title = {Exploring the parameter space of warm-inflation models},
author = {Bastero-Gil, Mar and Berera, Arjun and Kronberg, Nico},
abstractNote = {Warm inflation includes inflaton interactions with other fields throughout the inflationary epoch instead of confining such interactions to a distinct reheating era. Previous investigations have shown that, when certain constraints on the dynamics of these interactions and the resultant radiation bath are satisfied, a low-momentum-dominated dissipation coefficient ∝T{sup 3}/m{sub χ}{sup 2} can sustain an era of inflation compatible with CMB observations. In this work, we extend these analyses by including the pole-dominated dissipation term ∝√(m{sub χ}T)exp (−m{sub χ}/T). We find that, with this enhanced dissipation, certain models, notably the quadratic hilltop potential, perform significantly better. Specifically, we can achieve 50 e-folds of inflation and a spectral index compatible with Planck data while requiring fewer mediator field (O(10{sup 4}) for the quadratic hilltop potential) and smaller coupling constants, opening up interesting model-building possibilities. We also highlight the significance of the specific parametric dependence of the dissipative coefficient which could prove useful in even greater reduction in field content.},
doi = {10.1088/1475-7516/2015/12/046},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 12,
volume = 2015,
place = {United States},
year = {Tue Dec 22 00:00:00 EST 2015},
month = {Tue Dec 22 00:00:00 EST 2015}
}