Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2005-04-08
Class.Quant.Grav. 22 (2005) 2085-2100
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
Latex file, 22 pages, 1 figure, accepted for publication in Classical and Quantum Gravity
Scientific paper
10.1088/0264-9381/22/11/011
The light-like limit of the Kerr gravitational field relative to a distant observer moving rectilinearly in an arbitrary direction is an impulsive plane gravitational wave with a singular point on its wave front. By colliding particles with this wave we show that they have the same focussing properties as high speed particles scattered by the original black hole. By colliding photons with the gravitational wave we show that there is a circular disk, centered on the singular point on the wave front, having the property that photons colliding with the wave within this disk are reflected back and travel with the wave. This result is approximate in the sense that there are observers who can see a dim (as opposed to opaque) circular disk on their sky. By colliding plane electromagnetic waves with the gravitational wave we show that the reflected electromagnetic waves are the high frequency waves.
Barrabès Claude
Frolov Valeri P.
Hogan P. A.
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