https://doi.org/10.1140/epjc/s10052-019-7173-x
Letter
Decaying dark matter in halos of primordial black holes
1
Department of Physics, School of Engineering Sciences, KTH Royal Institute of Technology, AlbaNova University Center, Roslagstullsbacken 21, 106 91, Stockholm, Sweden
2
The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Center, Roslagstullsbacken 21, 106 91, Stockholm, Sweden
3
Science Institute, University of Iceland, Dunhaga 3, 107, Reykjavík, Iceland
* e-mail: florian.kuhnel@fysik.su.se
Received:
29
March
2019
Accepted:
27
July
2019
Published online:
14
August
2019
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 
, 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 
solar masses. Using future X-ray measurements, it will be possible to push these bounds on such combined dark-matter scenarios even further.
© The Author(s), 2019
