Speaker
Mr
Rodrigo Vicente
(CENTRA - Instituto Superior Técnico)
Description
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 $\sim GM/c^2$.
Primary authors
Mr
Rodrigo Vicente
(CENTRA - Instituto Superior Técnico)
Prof.
Vitor Cardoso
(CENTRA - Instituto Superior Técnico and CERN)
