http://arxiv.org/abs/1906.10140
We consider the interaction between a plane wave and a (counter-moving) black hole. We show that energy is transferred from the black hole to the wave, giving rise to a negative absorption cross-section. Moving black holes absorb radiation and deposit energy in external radiation. Due to this effect, a black hole hole of mass M moving at relativistic speeds in a cold medium will appear to be surrounded by a bright “ring” of diameter 3\sqrt{3}GM/c^2 and thickness GM/c^2.
V. Cardoso and R. Vicente
Wed, 26 Jun 19
33/68
Comments: 6 pages, 3 figures
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