Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-12
Astrophys.J. 613 (2004) 492-505
Astronomy and Astrophysics
Astrophysics
21 pages, 4 figures; AASTeX; v3 to match version to appear in ApJ
Scientific paper
10.1086/422497
We investigate generation of electromagnetic radiation by gravitational waves interacting with a strong magnetic field in the vicinity of a vibrating Schwarzschild black hole. Such an effect may play an important role in gamma-ray bursts and supernovae, their afterglows in particular. It may also provide an electromagnetic counterpart to gravity waves in many situations of interest, enabling easier extraction and verification of gravity wave waveforms from gravity wave detection. We set up the Einstein-Maxwell equations for the case of odd parity gravity waves impinging on a static magnetic field as a covariant and gauge-invariant system of differential equations which can be integrated as an initial value problem, or analysed in the frequency domain. We numerically investigate both of these cases. We find that the black hole ringdown process can produce substantial amounts of electromagnetic radiation from a dipolar magnetic field in the vicinity of the photon sphere.
Betschart Gerold
Clarkson Chris
Dunsby Peter
Marklund Mattias
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