In the Galaxies \([T_0]\)

As we have seen, the direct detection experiments, which are based in large majority on the neutrino detector principles, have not yet given any hints of dark matter presence in the neighborhood of the earth. Another possibility is to look for indirect effects of dark matter particles in our galaxy, or dwarf galaxies surrounding the Milky Way. The main idea underlying this kind of research is the possibility for dark matter to annihilate (or decay) in the interstellar medium, or generally near sources of gravity like the dynamical galactic centers, where the population of dark matter is the largest due to the gravitational well. The products of annihilation can be charged (like an electron–positron pair) or neutral (neutrino or photon final states). In this case, satellites or telescopes look directly for the product of annihilation. Another possibility is to observe the radiation emitted by these products, like synchrotron or bremsstrahlung effects, for instance.