Dish Antenna Searches for WISPy Dark Matter: Directional Resolution Small Mass Limitations

Understand

Hidden photon and axion-like dark matter may be detected using spherical reflective surfaces such as dish antenna setups converting some of the dark matter particles into photons and concentrating them on a detector.

• These setups may be used to perform directional searches measuring the dark matter momentum distribution.
• We briefly review the photon distribution one expects to detect with such an antenna and directional resolution in ray approximation.
• Furthermore we consider the regime $m_{DM} \lesssim (R_{sp}\,v_{DM})^{-1}$ where this approximation does not hold anymore due to the photon wavelength exceeding the expected distribution widths.