Erlangen 2026 – scientific programme
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GR: Fachverband Gravitation, Relativistische Astrophysik und Kosmologie
GR 6: Black Holes I
GR 6.1: Talk
Tuesday, March 17, 2026, 16:15–16:35, KH 02.012
Black holes as dark matter — •Jens Boos1, Christoph Borschensky1, Selin Asmanoglu2, and Christopher D. Carone2 — 1Karlsruhe Institute of Technology — 2William & Mary, USA
Evaporating black holes emit Hawking radiation. The radiation rate depends on the geometrical backreaction, described by greybody factors, which is needed for constraining their cosmological abundance via exctragalactic gamma-ray fluxes. However, if the black holes under consideration are of sub-stellar masses, corrections to general relativity become more relevant due to the increased curvature in the black hole vicinity. Moreover, such black holes have long been investigated as a potential constituent of cold dark matter. In this talk, we focus on non-singular black hole models (a possible parametric deformation from the vacuum black holes of general relativity) and demonstrate that the presence of a UV regulator in such geometries can increase the dark matter fraction by a factor of up to 10.
Keywords: primordial black holes; Hawking radiation; observational constraints on dark matter