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We calculate the neutrino signal resulting from annihilation of secluded darkmatter in the Sun. In this class of models, dark matter annihilates first intometastable mediators, which subsequently decay into Standard Model particles.If the mediators are long lived, they will propagate out from the dense solarcore before decaying. High energy neutrinos undergo absorption in the Sun. Inthe standard scenario in which neutrinos are produced directly in the centre ofthe Sun, absorption is relevant for E > 100 GeV, resulting in a significantsuppression of the neutrino spectrum beyond E ~ 1 TeV. In the secluded darkmatter scenario, the neutrino signal is greatly enhanced because neutrinos areinjected away from the core, at lower density. Since the solar density fallsexponentially with radius, metastable mediators have a significant effect onthe neutrino flux, even for decay lengths which are small compared to the solarradius. Moreover, since neutrino detection cross sections grow with energy,this enhancement of the high energy region of the neutrino spectrum would havea large effect on overall event rates.

Enhanced neutrino signals from dark matter annihilation in the Sun via metastable mediators