WISPers from the Dark Side: Radio Probes of Axions and Hidden Photons

Understand

Measurements in the radio regime embrace a number of effective approaches for WISP searches, often covering unique or highly complementary ranges of the parameter space compared to those explored in other research domains.

• These measurements can be used to search for electromagnetic tracers of the hidden photon and axion oscillations, extending down to ~10^-19 eV the range of the hidden photon mass probed, and closing the last gaps in the strongly favoured 1-5 micro-eV range for axion dark matter.
• This provides a strong impetus for several new initiatives in the field, including the WISP Dark Matter eXperiment (WISPDMX) and novel conceptual approaches for broad-band WISP searches in the 0.1-1000 micro-eV range.