1207.1341 (Jae Ho Heo et al.)

Cosmic ray signatures of Dipole-Interacting Fermionic Dark Matter    [PDF]

Jae Ho Heo, C. S. Kim

Cosmic ray signals from dipole-interacting dark matter annihilation are considered in the positron, antiproton and photon channels. The predicted signals in the positron channel could nicely account for the excess of positron fraction from Fermi LAT, PAMELA, HEAT and AMS-01 experiments for dark matter mass larger than 100 GeV with a boost (enhancement) factor of 30-80. No excess of antiproton over proton ratio at the experiments also gives a severe restriction for this scenario. The predicted signals as monoenergetic gamma-ray lines (monochromatic photons) for the region close to the Galactic center are investigated, and we show that they are in the current observational experimental constraint. To the end, the gamma-ray excess of recent tentative analyses based on Fermi LAT data and the potential probe of the monochromatic lines at a planned experiment, AMS-02, are also considered.

View original: http://arxiv.org/abs/1207.1341