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High Energy Physics - Phenomenology

arXiv:1310.5143 (hep-ph)
[Submitted on 18 Oct 2013 (v1), last revised 8 Jul 2014 (this version, v2)]

Title:Quantifying the reheating temperature of the universe

Authors:Anupam Mazumdar, Bryan Zaldívar
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Abstract:The aim of this paper is to determine an exact definition of the reheat temperature for a generic perturbative decay of the inflaton. In order to estimate the reheat temperature, there are two important conditions one needs to satisfy: (a) the decay products of the inflaton must dominate the energy density of the universe, i.e. the universe becomes completely radiation dominated, and (b) the decay products of the inflaton have attained local thermodynamical equilibrium. For some choices of parameters, the latter is a more stringent condition, such that the decay products may thermalise much after the beginning of radiation-domination. Consequently, we have obtained that the reheat temperature can be much lower than the standard-lore estimation. In this paper we describe under what conditions our universe could have efficient or inefficient thermalisation, and quantify the reheat temperature for both the scenarios. This result has an immediate impact on many applications which rely on the thermal history of the universe, in particular gravitino abundance.
Comments: Discussion improved. New section added. Version matches the one accepted for publication
Subjects: High Energy Physics - Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
Cite as: arXiv:1310.5143 [hep-ph]
  (or arXiv:1310.5143v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.1310.5143
Related DOI: https://doi.org/10.1016/j.nuclphysb.2014.07.001

Submission history

From: Bryan Zaldívar Montero [view email]
[v1] Fri, 18 Oct 2013 20:00:00 UTC (300 KB)
[v2] Tue, 8 Jul 2014 22:00:17 UTC (504 KB)
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