Using the Uncharged Kerr Black Hole as a Gravitational Mirror

Details Using the Uncharged Kerr Black Hole as a Gravitational Mirror Using the Uncharged Kerr Black Hole as a Gravitational Mirror

1995-10-25

arxiv.org/abs/gr-qc/9510053v1

Gen.Rel.Grav. 29 (1997) 445-454

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages Latex, 3 Postscript figures, uufiles to compress

Scientific paper

We extend the study of the possibility to use the Schwarzschild black hole as a gravitational mirror to the more general case of an uncharged Kerr black hole. We use the null geodesic equation in the equatorial plane to prove a theorem concerning the conditions the impact parameter has to satisfy if there shall exist boomerang photons. We derive an equation for these boomerang photons and an equation for the emission angle. Finally, the radial null geodesic equation is integrated numerically in order to illustrate boomerang photons.

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