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Title: Thermal Dark Matter Below a MeV

Abstract

We consider a class of models in which thermal dark matter is lighter than a MeV. If dark matter thermalizes with the standard model below the temperature of neutrino-photon decoupling, equilibration and freeze-out cool and heat the standard model bath comparably, alleviating constraints from measurements of the effective number of neutrino species. We demonstrate this mechanism in a model consisting of fermionic dark matter coupled to a light scalar mediator. Thermal dark matter can be as light as a few keV, while remaining compatible with existing cosmological and astrophysical observations. This framework motivates new experiments in the direct search for sub-MeV thermal dark matter and light force carriers.

Authors:
;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1416059
Alternate Identifier(s):
OSTI ID: 1417629
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Name: Physical Review Letters Journal Volume: 120 Journal Issue: 2; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Berlin, Asher, and Blinov, Nikita. Thermal Dark Matter Below a MeV. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.120.021801.
Berlin, Asher, & Blinov, Nikita. Thermal Dark Matter Below a MeV. United States. doi:10.1103/PhysRevLett.120.021801.
Berlin, Asher, and Blinov, Nikita. Mon . "Thermal Dark Matter Below a MeV". United States. doi:10.1103/PhysRevLett.120.021801.
@article{osti_1416059,
title = {Thermal Dark Matter Below a MeV},
author = {Berlin, Asher and Blinov, Nikita},
abstractNote = {We consider a class of models in which thermal dark matter is lighter than a MeV. If dark matter thermalizes with the standard model below the temperature of neutrino-photon decoupling, equilibration and freeze-out cool and heat the standard model bath comparably, alleviating constraints from measurements of the effective number of neutrino species. We demonstrate this mechanism in a model consisting of fermionic dark matter coupled to a light scalar mediator. Thermal dark matter can be as light as a few keV, while remaining compatible with existing cosmological and astrophysical observations. This framework motivates new experiments in the direct search for sub-MeV thermal dark matter and light force carriers.},
doi = {10.1103/PhysRevLett.120.021801},
journal = {Physical Review Letters},
number = 2,
volume = 120,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevLett.120.021801

Citation Metrics:
Cited by: 11 works
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