Searching for WISPy Cold Dark Matter with a Dish Antenna
  The cold dark matter of the Universe may be comprised of very light and very weakly interacting particles, so-called WISPs. Two prominent examples are hidden photons and axion-like particles. In this note we propose a new technique to sensitively search for this type of dark matter with dish antennas. The technique is broadband and allows to explore a whole range of masses in a single measurement. 
Dieter Horns, Joerg Jaeckel, Axel Lindner, Andrei Lobanov, Javier   Redondo and Andreas Ringwald
hep-ph hep-ex