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Enhancement of the annihilation of dark matter in a radiative seesaw model

Enhancement of the annihilation of dark matter in a radiative seesaw model,10.1103/PhysRevD.82.013012,Physical Review D,Daijiro Suematsu,Takashi Toma,

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Enhancement of the annihilation of dark matter in a radiative seesaw model  
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The radiative seesaw model with an inert doublet has been shown to be attractive from a viewpoint of both neutrino masses and cold dark matter. However, if we apply this model to the explanation of the positron excess in the cosmic ray observed by PAMELA, a huge boost factor is required although it can be automatically explained that no antiproton excess has been observed there. We consider an extension of the model to enhance the thermally averaged annihilation cross section without changing the features of the model favored by both the neutrino oscillation and the relic abundance of dark matter. It is shown that the data of PAMELA and Fermi-LAT can be well explained in this extended model. Constraints from gamma ray observations are also discussed.
Journal: Physical Review D - PHYS REV D , vol. 82, no. 1, 2010
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