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A Fourth Exception in the Calculation of Relic Abundances

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arxiv 1705.08450 v3 pith:Z47VKN7X submitted 2017-05-23 hep-ph astro-ph.CO

classification hep-phastro-ph.CO
keywords darkmattercoscatteringstatesabundanceabundancesannihilationannihilations
verification ladder T0 review T1 audit T2 compute T3 formal
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We propose that the dark matter abundance is set by the decoupling of inelastic scattering instead of annihilations. This coscattering mechanism is generically realized if dark matter scatters against states of comparable mass from the thermal bath. Coscattering points to dark matter that is exponentially lighter than the weak scale and has a suppressed annihilation rate, avoiding stringent constraints from indirect detection. Dark matter upscatters into states whose late decays can lead to observable distortions to the blackbody spectrum of the cosmic microwave background.

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Cited by 15 Pith papers

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