Capture of Inelastic Dark Matter in the Sun

Abstract

We consider the capture of dark matter in the Sun by inelastic scattering against nuclei as in the inelastic dark matter scenario. We show that, assuming a WIMP-nucleon cross-section of σ_n = 10^{-40}\cm^2 the resulting capture rate and density are sufficiently high so that current bounds on the muon neutrino flux from the Sun rule out any appreciable annihilation branching ratio of WIMPs into W^+W^-, Z^0Z^0, τ^+τ^-, t\bar{t} and neutrinos. Slightly weaker bounds are also available for annihilations into b\bar{b} and c\bar{c}. Annihilations into lighter particles that may produce neutrinos, such as μ^+μ^-, pions and kaons are unconstrained since those stop in the Sun before decaying. Interestingly enough, this is consistent with some recent proposals motivated by the PAMELA results for the annihilation of WIMPs into light bosons which subsequently decay predominantly into light leptons and pions.

19 pages, 7 figures, published version. Cosmetic changes to figures and some discussions clarified. Conclusions unchanged

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• Split Dirac Supersymmetry: An Ultraviolet Completion of Higgsino Dark Matter
• Search for dark matter signatures in the gamma-ray emission towards the Sun with the Fermi Large Area Telescope
• Searches for Long Lived Neutral Particles
• Decaying into the Hidden Sector
• Isospin-Violating Dark Matter and Neutrinos From the Sun
• Constraints on dark matter models from a Fermi LAT search for high-energy cosmic-ray electrons from the Sun
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• Discovering Asymmetric Dark Matter with Anti-Neutrinos
• Enhancement of dark matter capture by neutron stars in binary systems
• A search for dark matter cosmic-ray electrons and positrons from the Sun with the Fermi Large Area Telescope
• Neutrino Constraints on Inelastic Dark Matter after CDMS II
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• Detecting Asymmetric Dark Matter in the Sun with Neutrinos
• The distribution of inelastic dark matter in the Sun
• New constraints on inelastic dark matter from IceCube
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• Dark Matter Mini-halo around the Compact Objects: the Formation, Evolution and Possible Contribution to the Cosmic Ray Electrons/Positrons
• Halo-independent bounds on Inelastic Dark Matter
• Indirect searches for dark matter with the Fermi LAT instrument
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