Kommende 5 dager
Martin Vollmann, Universität Hamburg,
Monochromatic gamma-ray lines have long been known to provide potential smoking gun signals for annihilating dark matter. In this talk I will show that for Kaluza-Klein dark matter a particularly interesting phenomenon occurs since in that case resonant annihilation is generically expected for small, but not necessarily vanishing relative velocities of the annihilating particles.
I will talk about the contribution from those hitherto neglected resonances and discuss how the annihilation rate of dark matter particles into monochromatic photons can be significantly enhanced, resulting in promising prospects for the detection of TeV-scale Kaluza-Klein dark matter. I will also point out that the situation may be even more interesting in the vicinity of black holes, like the supermassive black hole at the center of our Galaxy, where in principle center-of-mass energies much larger than the rest mass are available.