case western reserve university



Exotic physics in the sky: light dark matter and superconducting strings

Francesc Ferrer (Case Physics)

The foremost candidate for the cold dark matter composing galactic haloes is the neutralino, which in models with an extended Higgs sector can be naturally very light and difficult to discover by direct dark matter detection experiments. Indirect detection rates, however, are generically larger with respect to the standard case. We explore the expected signals in neutrino telescopes, and in space-based gamma-ray and antimatter search experiments. Although a neutralino in the MeV mass range could also account for the 511 KeV emission from the Galactic Center, measurements of the diffuse radiation disfavor this scenario. Alternatively, we will show that a network of superconducting cosmic strings can be at the origin of the required positron flux.