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Title: Making dark matter out of light: Freeze-in from plasma effects

Abstract

Dark matter (DM) could couple to particles in the Standard Model (SM) through a light vector mediator. In the limit of small coupling, this portal could be responsible for producing the observed DM abundance through a mechanism known as freeze-in. Furthermore, the requisite DM-SM couplings provide a concrete benchmark for direct and indirect searches for DM. We present updated calculations of the relic abundance for DM produced by freeze-in through a light vector mediator. We identify an additional production channel: the decay of photons that acquire an in-medium plasma mass. These plasmon decays are a dominant channel for DM production for sub-MeV DM masses, and including this channel leads to a significant reduction in the predicted signal strength for DM searches. Accounting for production from both plasmon decays and annihilations of SM fermions, the DM acquires a highly nonthermal phase-space distribution which impacts the cosmology at later times; these cosmological effects will be explored in a companion paper.

Authors:
; ;
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF); Hertz Foundation
OSTI Identifier:
1525559
Alternate Identifier(s):
OSTI ID: 1593893
Grant/Contract Number:  
[SC0019195; SC0019018; PHY-1748958; AST-1813694]
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
[Journal Name: Physical Review D Journal Volume: 99 Journal Issue: 11]; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Dvorkin, Cora, Lin, Tongyan, and Schutz, Katelin. Making dark matter out of light: Freeze-in from plasma effects. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.99.115009.
Dvorkin, Cora, Lin, Tongyan, & Schutz, Katelin. Making dark matter out of light: Freeze-in from plasma effects. United States. doi:10.1103/PhysRevD.99.115009.
Dvorkin, Cora, Lin, Tongyan, and Schutz, Katelin. Tue . "Making dark matter out of light: Freeze-in from plasma effects". United States. doi:10.1103/PhysRevD.99.115009.
@article{osti_1525559,
title = {Making dark matter out of light: Freeze-in from plasma effects},
author = {Dvorkin, Cora and Lin, Tongyan and Schutz, Katelin},
abstractNote = {Dark matter (DM) could couple to particles in the Standard Model (SM) through a light vector mediator. In the limit of small coupling, this portal could be responsible for producing the observed DM abundance through a mechanism known as freeze-in. Furthermore, the requisite DM-SM couplings provide a concrete benchmark for direct and indirect searches for DM. We present updated calculations of the relic abundance for DM produced by freeze-in through a light vector mediator. We identify an additional production channel: the decay of photons that acquire an in-medium plasma mass. These plasmon decays are a dominant channel for DM production for sub-MeV DM masses, and including this channel leads to a significant reduction in the predicted signal strength for DM searches. Accounting for production from both plasmon decays and annihilations of SM fermions, the DM acquires a highly nonthermal phase-space distribution which impacts the cosmology at later times; these cosmological effects will be explored in a companion paper.},
doi = {10.1103/PhysRevD.99.115009},
journal = {Physical Review D},
number = [11],
volume = [99],
place = {United States},
year = {2019},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.99.115009

Citation Metrics:
Cited by: 5 works
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