Warm dark matter via ultraviolet freezein: reheating temperature and nonthermal distribution for fermionic Higgs portal dark matter
Abstract
Warm dark matter (WDM) of order keV mass may be able to resolve the disagreement between structure formation in cold dark matter simulations and observations. The detailed properties of WDM will depend upon its energy distribution, in particular how it deviates from the thermal distribution usually assumed in WDM simulations. Here we focus on WDM production via the UltraViolet (UV) freezein mechanism, for the case of fermionic Higgs portal dark matter ψ produced via the portal interaction ψbarψH{sup †}H/Λ. We introduce a new method to simplify the computation of the nonthermal energy distribution of dark matter from freezein. We show that the nonthermal energy distribution from UV freezein is hotter than the corresponding thermal distribution and has the form of a BoseEinstein distribution with a nonthermal normalization. The resulting range of dark matter fermion mass consistent with observations is 5–7 keV. The reheating temperature must satisfy T{sub R}≳120 GeV in order to account for the observed dark matter density when m{sub ψ}≈5 keV, where the lower bound on T{sub R} corresponds to the limit where the fermion mass is entirely due to electroweak symmetry breaking via the portal interaction. The corresponding bound on the interaction scale is Λ≳6.0×10{sup 9} GeV.
 Authors:
 Dept. of Physics, University of Lancaster,Lancaster LA1 4YB (United Kingdom)
 Publication Date:
 Sponsoring Org.:
 SCOAP3, CERN, Geneva (Switzerland)
 OSTI Identifier:
 22572132
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2016; Journal Issue: 08; Other Information: PUBLISHERID: JCAP08(2016)035; OAI: oai:repo.scoap3.org:16830; ccby 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:
 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BOSEEINSTEIN STATISTICS; CALCULATION METHODS; ENERGY SPECTRA; FERMIONS; GEV RANGE 1001000; HIGGS BOSONS; HIGGS MODEL; KEV RANGE 0110; NONLUMINOUS MATTER; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; REST MASS; SYMMETRY BREAKING; UNIVERSE; WEINBERGSALAM GAUGE MODEL
Citation Formats
McDonald, John. Warm dark matter via ultraviolet freezein: reheating temperature and nonthermal distribution for fermionic Higgs portal dark matter. United States: N. p., 2016.
Web. doi:10.1088/14757516/2016/08/035.
McDonald, John. Warm dark matter via ultraviolet freezein: reheating temperature and nonthermal distribution for fermionic Higgs portal dark matter. United States. doi:10.1088/14757516/2016/08/035.
McDonald, John. 2016.
"Warm dark matter via ultraviolet freezein: reheating temperature and nonthermal distribution for fermionic Higgs portal dark matter". United States.
doi:10.1088/14757516/2016/08/035.
@article{osti_22572132,
title = {Warm dark matter via ultraviolet freezein: reheating temperature and nonthermal distribution for fermionic Higgs portal dark matter},
author = {McDonald, John},
abstractNote = {Warm dark matter (WDM) of order keV mass may be able to resolve the disagreement between structure formation in cold dark matter simulations and observations. The detailed properties of WDM will depend upon its energy distribution, in particular how it deviates from the thermal distribution usually assumed in WDM simulations. Here we focus on WDM production via the UltraViolet (UV) freezein mechanism, for the case of fermionic Higgs portal dark matter ψ produced via the portal interaction ψbarψH{sup †}H/Λ. We introduce a new method to simplify the computation of the nonthermal energy distribution of dark matter from freezein. We show that the nonthermal energy distribution from UV freezein is hotter than the corresponding thermal distribution and has the form of a BoseEinstein distribution with a nonthermal normalization. The resulting range of dark matter fermion mass consistent with observations is 5–7 keV. The reheating temperature must satisfy T{sub R}≳120 GeV in order to account for the observed dark matter density when m{sub ψ}≈5 keV, where the lower bound on T{sub R} corresponds to the limit where the fermion mass is entirely due to electroweak symmetry breaking via the portal interaction. The corresponding bound on the interaction scale is Λ≳6.0×10{sup 9} GeV.},
doi = {10.1088/14757516/2016/08/035},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 08,
volume = 2016,
place = {United States},
year = 2016,
month = 8
}

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