Erlangen 2026 – wissenschaftliches Programm

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GR: Fachverband Gravitation, Relativistische Astrophysik und Kosmologie

GR 6: Black Holes I

GR 6.1: Vortrag

Dienstag, 17. März 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