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Nonthermal Axino as Cool Dark Matter in Supersymmetric Standard Model without R-parity
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Nonthermal Axino as Cool Dark Matter in Supersymmetric Standard Model without R-parity
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We point out that the axino predicted as the supersymmetric partner of the axion is a good candidate for the recently proposed sterile neutrino cool dark matter. The axino mass falls into the right range in the context of gauge mediated supersymmetry breaking. A sizable mixing of the axino with active neutrinos arises when R-parity violation is allowed and the resulting neutrino masses and mixing accommodate the atmospheric and solar neutrino oscillations simultaneously.
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