Disk illumination by black hole superradiance of electromagnetic perturbations

Details Disk illumination by black hole superradiance of electromagnetic perturbations Disk illumination by black hole superradiance of electromagnetic perturbations

2008-02-07

arxiv.org/abs/0802.0951v2

Phys.Rev.D77:064011,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, 4 figures, corrected typos, published in Physical Review D

Scientific paper

10.1103/PhysRevD.77.064011

Using the Kerr-Schild formalism to solve the Einstein-Maxwell equations, we study energy transport due to time-dependent electromagnetic perturbations around a Kerr black hole, which may work as a mechanism to illuminate a disk located on the equatorial plane. For such a disk-hole system it is found that the energy extraction from the hole can occur under the well-known superradiance condition for wave frequency, even though the energy absorption into the hole should be rather dominant near the polar region of the horizon. We estimate the efficiency of the superradiant amplification of the disk illumination. Further we calculate the time-averaged energy density distribution to show explicitly the existence of a negative energy region near the horizon and to discuss the possible generation of a hot spot on the disk.

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