Enabling forbidden dark matter
Abstract
The thermal relic density of dark matter is conventionally set by two-body annihilations. We point out that in many simple models, 3 → 2 annihilations can play an important role in determining the relic density over a broad range of model parameters. This occurs when the two-body annihilation is kinematically forbidden, but the 3 → 2 process is allowed; we call this scenario not-forbidden dark matter. We illustrate this mechanism for a vector-portal dark matter model, showing that for a dark matter mass of mχ ~ MeV-10 GeV, 3 → 2 processes not only lead to the observed relic density, but also imply a selfinteraction cross section that can solve the cusp/core problem. This can be accomplished while remaining consistent with stringent CMB constraints on light dark matter, and can potentially be discovered at future direct detection experiments.
- Authors:
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1400426
- Alternate Identifier(s):
- OSTI ID: 1503863
- Grant/Contract Number:
- SC0013999; SC00012567
- Resource Type:
- Published Article
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Name: Physical Review D Journal Volume: 96 Journal Issue: 8; 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; dark matter
Citation Formats
Cline, James M., Liu, Hongwan, Slatyer, Tracy R., and Xue, Wei. Enabling forbidden dark matter. United States: N. p., 2017.
Web. doi:10.1103/PhysRevD.96.083521.
Cline, James M., Liu, Hongwan, Slatyer, Tracy R., & Xue, Wei. Enabling forbidden dark matter. United States. doi:10.1103/PhysRevD.96.083521.
Cline, James M., Liu, Hongwan, Slatyer, Tracy R., and Xue, Wei. Fri .
"Enabling forbidden dark matter". United States. doi:10.1103/PhysRevD.96.083521.
@article{osti_1400426,
title = {Enabling forbidden dark matter},
author = {Cline, James M. and Liu, Hongwan and Slatyer, Tracy R. and Xue, Wei},
abstractNote = {The thermal relic density of dark matter is conventionally set by two-body annihilations. We point out that in many simple models, 3 → 2 annihilations can play an important role in determining the relic density over a broad range of model parameters. This occurs when the two-body annihilation is kinematically forbidden, but the 3 → 2 process is allowed; we call this scenario not-forbidden dark matter. We illustrate this mechanism for a vector-portal dark matter model, showing that for a dark matter mass of mχ ~ MeV-10 GeV, 3 → 2 processes not only lead to the observed relic density, but also imply a selfinteraction cross section that can solve the cusp/core problem. This can be accomplished while remaining consistent with stringent CMB constraints on light dark matter, and can potentially be discovered at future direct detection experiments.},
doi = {10.1103/PhysRevD.96.083521},
journal = {Physical Review D},
number = 8,
volume = 96,
place = {United States},
year = {2017},
month = {10}
}
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DOI: 10.1103/PhysRevD.96.083521
DOI: 10.1103/PhysRevD.96.083521
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