Decaying Dark Matter in Halos of Primordial Black Holes
Abstract
We investigate photon signatures of general decaying dark-matter particles in halos of primordial black holes. We derive the halo-profile density and the total decay rate for these combined dark-matter scenarios. For the case of axion-like particles of masses below O( 1 )\,keV, we find strong bounds on the decay constant which are several orders of magnitude stronger than the strongest existing bounds, for all halo masses above O( 10-5 ) solar masses. Using future X-ray measurements, it will be possible to push these bounds on such combined dark-matter scenarios even further.
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