Institut de recherche sur les lois fondamentales de l'Univers

After a brief review on the status of indirect Dark Matter (DM) searches, I will discuss how the formation and growth of Intermediate and Supermassive Black Holes can greatly enhance the density of surrounding DM, thus "boosting" its annihilation signal. I will show that, for typical values of mass and cross section of common DM candidates, these so-called "mini-spikes" would be bright sources of gamma-rays , which could be easily detected with GLAST, and further studied with Air Cherenkov Telescopes. Finally, I will discuss the implications of this scenario for anti-matter and high-energy neutrino searches with upcoming km scale experiments.