Journal
PHYSICAL REVIEW D
Volume 96, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.96.083521
Keywords
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Funding
- NSERC (Canada)
- FRQNT (Quebec)
- U.S. Department of Energy [DE-SC-00012567, DE-SC-0013999]
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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 mailer. We illustrate this mechanism for a vector-portal dark matter model, showing that for a dark matter mass of m(x)similar to MeV-10 GeV, 3 -> 2 processes not only lead to the observed relic density, but also imply a self-interaction 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.
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