Low reheating temperatures in monomial and binomial inflationary models
Abstract
We investigate the allowed range of reheating temperature values in light of the Planck 2015 results and the recent joint analysis of Cosmic Microwave Background (CMB) data from the BICEP2/Keck Array and Planck experiments, using monomial and binomial inflationary potentials. While the well studied Φ ^{2} inflationary potential is no longer favored by current CMB data, as well as Φ ^{P} with p>2, a Φ ^{1} potential and canonical reheating (0w _{re}=) provide a good fit to the CMB measurements. In this last case, we find that the Planck 2015 68% confidence limit upper bound on the spectral index, n _{s}, implies an upper bound on the reheating temperature of T _{re}≲ 6x 10 ^{10} GeV, and excludes instantaneous reheating. The low reheating temperatures allowed by this model open the possibility that dark matter could be produced during the reheating period instead of when the Universe is radiation dominated, which could lead to very different predictions for the relic density and momentum distribution of WIMPs, sterile neutrinos, and axions. We also study binomial inflationary potentials and show the effects of a small departure from a Φ ^{1} potential. We find that as a subdominant Φ ^{2} term in the potentialmore »
 Authors:

 Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
 Publication Date:
 Research Org.:
 Univ. of California, Los Angeles, CA (United States)
 Sponsoring Org.:
 USDOE; National Science Foundation (NSF)
 OSTI Identifier:
 1454803
 Grant/Contract Number:
 SC0009937; PHY1125915
 Resource Type:
 Journal Article: Accepted Manuscript
 Journal Name:
 Journal of Cosmology and Astroparticle Physics
 Additional Journal Information:
 Journal Volume: 2015; Journal Issue: 06; Journal ID: ISSN 14757516
 Publisher:
 Institute of Physics (IOP)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTRONOMY AND ASTROPHYSICS; infation; physics of the early universe
Citation Formats
Rehagen, Thomas, and Gelmini, Graciela B. Low reheating temperatures in monomial and binomial inflationary models. United States: N. p., 2015.
Web. doi:10.1088/14757516/2015/06/039.
Rehagen, Thomas, & Gelmini, Graciela B. Low reheating temperatures in monomial and binomial inflationary models. United States. doi:10.1088/14757516/2015/06/039.
Rehagen, Thomas, and Gelmini, Graciela B. Tue .
"Low reheating temperatures in monomial and binomial inflationary models". United States. doi:10.1088/14757516/2015/06/039. https://www.osti.gov/servlets/purl/1454803.
@article{osti_1454803,
title = {Low reheating temperatures in monomial and binomial inflationary models},
author = {Rehagen, Thomas and Gelmini, Graciela B.},
abstractNote = {We investigate the allowed range of reheating temperature values in light of the Planck 2015 results and the recent joint analysis of Cosmic Microwave Background (CMB) data from the BICEP2/Keck Array and Planck experiments, using monomial and binomial inflationary potentials. While the well studied Φ2 inflationary potential is no longer favored by current CMB data, as well as ΦP with p>2, a Φ1 potential and canonical reheating (0wre=) provide a good fit to the CMB measurements. In this last case, we find that the Planck 2015 68% confidence limit upper bound on the spectral index, ns, implies an upper bound on the reheating temperature of Tre≲ 6x 1010 GeV, and excludes instantaneous reheating. The low reheating temperatures allowed by this model open the possibility that dark matter could be produced during the reheating period instead of when the Universe is radiation dominated, which could lead to very different predictions for the relic density and momentum distribution of WIMPs, sterile neutrinos, and axions. We also study binomial inflationary potentials and show the effects of a small departure from a Φ1 potential. We find that as a subdominant Φ2 term in the potential increases, first instantaneous reheating becomes allowed, and then the lowest possible reheating temperature of Tre =4 MeV is excluded by the Planck 2015 68% confidence limit.},
doi = {10.1088/14757516/2015/06/039},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {14757516},
number = 06,
volume = 2015,
place = {United States},
year = {2015},
month = {6}
}
Web of Science