WISP Dark Matter eXperiment and Prospects for Broadband Dark Matter Searches in the 1 eV-10 meV Mass Range

Light cold dark matter consisting of weakly interacting slim (or sub-eV) particles (WISPs) has been in the focus of a large number of studies made over the past two decades. The QCD axion and axion-like particles with masses in the 0. 1 eV-100 meV are strong candidates for the dark matter particle, together with hidden photons with masses below 100 meV. This motivates several new initiatives in the field, including the WISP Dark Matter eXperiment (WISPDMX) and novel conceptual approaches for broad-band WISP searches using radiometry measurements in large volume chambers. First results and future prospects for these experiments are discussed in this contribution.