WIMP capture by the Sun in the effective theory of dark matter self-interactions

Abstract

We study the capture of WIMP dark matter by the Sun in the non-relativistic effective theory of dark matter self-interactions. The aim is to assess the impact of self-interactions on the expected neutrino flux from the annihilation of WIMPs trapped in the Sun in a model independent manner. We consider all non-relativistic Galilean invariant self-interaction operators that can arise from the exchange of a heavy particle of spin less than or equal to 1 for WIMPs of spin equal to 0, 1/2 and 1. We show that for interaction operators depending at most linearly on the momentum transfer, the WIMP-induced neutrino flux can be enhanced by several orders of magnitude compared to the same flux in absence of self-interactions. This is true even for standard values of the thermally averaged annihilation cross-section. This conclusion impacts the analysis of present and future observations performed at neutrino telescopes.

19 pages, 6 figures

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• A combined analysis of PandaX, LUX, and XENON1T experiments within the framework of dark matter effective theory
• WIMP capture and annihilation in the Earth in effective theories
• Neutrinos from the Sun can discover dark matter-electron scattering
• Assessing the sensitivity of PINGU to effective dark matter-nucleon interactions
• Super-Kamiokande Strongly Constrains Leptophilic Dark Matter Capture in the Sun