Moving black holes: energy extraction, absorption cross-section and the ring of fire. (arXiv:1906.10140v1 [gr-qc])
<a href="http://arxiv.org/find/gr-qc/1/au:+Cardoso_V/0/1/0/all/0/1">Vitor Cardoso</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Vicente_R/0/1/0/all/0/1">Rodrigo Vicente</a>
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 3sqrt{3}GM/c^2 and thickness
GM/c^2.
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 3sqrt{3}GM/c^2 and thickness
GM/c^2.
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