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); 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. https://doi.org/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. https://doi.org/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}
}
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https://doi.org/10.1103/PhysRevD.99.115009
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