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Title: 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 m χ ~ 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:
 [1];  [2];  [2];  [2]
  1. European Organization for Nuclear Research (CERN), Geneva (Switzerland); Rue Univ., Montreal, QC (Canada)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
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 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

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}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/physrevd.96.083521

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Cited by: 10 works
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