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• W2095792194 endingPage "021" @default.
• W2095792194 startingPage "021" @default.
• W2095792194 abstract "Self-interacting dark matter scenarios have recently attracted much attention, as a possible means to alleviate the tension between N-body simulations and observations of the dark matter distribution on galactic and sub-galactic scales. The presence of internal structure for the dark matter—for example, a nearly-degenerate state in the spectrum that could decay, or be collisionally excited or de-excited—has also been proposed as a possible means to address these discrepancies. Such internal structure can be a source of interesting signatures in direct and indirect dark matter searches, for example providing a novel explanation for the 3.5 keV line recently observed in galaxies and galaxy clusters. We analyze a simple model of dark matter self-scattering including a nearly-degenerate excited state, and develop an accurate analytic approximation for the elastic and inelastic s-wave cross sections, which is valid outside the perturbative regime provided the particle velocity is sufficiently low (this condition is also required for the s-wave to dominate over higher partial waves). We anticipate our results will be useful in incorporating inelastic self-scattering into N-body simulations, in order to study the quantitative impact of nearly-degenerate states in the dark matter spectrum on galactic structure and dynamics, and in computing the indirect signatures of multi-state dark matter." @default.
• W2095792194 created "2016-06-24" @default.
• W2095792194 creator A5047206136 @default.
• W2095792194 creator A5057537951 @default.
• W2095792194 date "2015-01-14" @default.
• W2095792194 modified "2023-09-27" @default.
• W2095792194 title "Self-scattering for Dark Matter with an excited state" @default.
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• W2095792194 doi "https://doi.org/10.1088/1475-7516/2015/01/021" @default.
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