Journal
PHYSICAL REVIEW LETTERS
Volume 117, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.211801
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Funding
- National Science Foundation (NSF) [PHY-1316222]
- National Science and Engineering Research Council of Canada (NSERC) [PGSD3-438393-2013]
- Hans Bethe Postdoctoral Fellowship at Cornell
- Division Of Physics
- Direct For Mathematical & Physical Scien [1316222] Funding Source: National Science Foundation
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We propose a new mechanism for thermal dark matter freeze-out, called codecaying dark matter. Multicomponent dark sectors with degenerate particles and out-of-equilibrium decays can codecay to obtain the observed relic density. The dark matter density is exponentially depleted through the decay of nearly degenerate particles rather than from Boltzmann suppression. The relic abundance is set by the dark matter annihilation cross section, which is predicted to be boosted, and the decay rate of the dark sector particles. The mechanism is viable in a broad range of dark matter parameter space, with a robust prediction of an enhanced indirect detection signal. Finally, we present a simple model that realizes codecaying dark matter.
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