PT Journal AU Fornengo, N Lineros, RA Regis, M Taoso, M TI Cosmological radio emission induced by WIMP Dark Matter SO Journal of Cosmology and Astroparticle Physics JI J. Cosmol. Astropart. Phys. PY 2012 BP 033 EP 27pp VL 03 IS 3 DI 10.1088/1475-7516/2012/03/033 LA English DE dark matter theory; power spectrum AB We present a detailed analysis of the radio synchrotron emission induced by WIMP dark matter annihilations and decays in extragalactic halos. We compute intensity, angular correlation, and source counts and discuss the impact on the expected signals of dark matter clustering, as well as of other astrophysical uncertainties as magnetic fields and spatial diffusion. Bounds on dark matter microscopic properties are then derived, and, depending on the specific set of assumptions, they are competitive with constraints from other indirect dark matter searches. At GHz frequencies, dark matter sources can become a significant fraction of the total number of sources with brightness below the microJansky level. We show that, at this level of fluxes (which are within the reach of the next-generation radio surveys), properties of the faint edge of differential source counts, as well as angular correlation data, can become an important probe for WIMPs. ER