If the dark matter consists of a WIMP of some sort, the non-zero cross section
ordinary matter will make the WIMPs cluster around heavy objects, such as the
giving the Sun a WIMP halo. WIMP annihilations within this halo would give rise
gamma rays with very low background since the Sun does not produce photons
We have made quite detailed Monte Carlo simulations of this overdensity of
around the Sun and calculated the gamma ray flux at earth from this halo. It is
interesting to note that the density of WIMPs around the Sun does effectively
depend on the magnitude of the cross section with ordinary matter, which is
crucial in other searches for dark matter.
Unfortunately, however, the calculated gamma ray flux at Earth from the WIMP
around the Sun is found to be quite low.