Ultrahigh energy cosmic rays from collisional annihilation revisited

We re-examine collisional annihilation of superheavy dar k matter particles in dark matter density spikes in the galactic halo as a possible sour ce of ultrahigh energy cosmic rays. We estimate the possible flux in a way that does not depen on detailed assumptions about the density profiles of dark matter clumps. The result c onfirms that collisional… CONTINUE READING