Absorption of electromagnetic and gravitational waves by Kerr black holes

Abstract

We calculate the absorption cross section for planar waves incident upon Kerr black holes, and present a unified picture for scalar, electromagnetic and gravitational waves. We highlight the spin-helicity effect that arises from a coupling between the rotation of the black hole and the helicity of a circularlypolarized wave. For the case of on-axis incidence, we introduce an extended ‘sinc approximation’ to quantify the spin-helicity effect in the strong-field regime.

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Item Type:	Article
Authors/Creators:	Leite, L.C.S. Dolan, S.R. https://orcid.org/0000-0002-4672-6523 Crispino, L.C.B.
Copyright, Publisher and Additional Information:	© 2017 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.
Dates:	Published: 10 November 2017 Published (online): 25 September 2017 Accepted: 17 September 2017
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield)
Funding Information:	Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/M025802/1 SCIENCE AND TECHNOLOGY FACILITIES COUNCIL ST/L000520/1
Depositing User:	Symplectic Sheffield
Date Deposited:	19 Oct 2017 11:21
Last Modified:	19 Oct 2017 11:24
Published Version:	https://doi.org/10.1016/j.physletb.2017.09.048
Status:	Published
Publisher:	Elsevier
Refereed:	Yes
Identification Number:	10.1016/j.physletb.2017.09.048
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:122822

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Absorption of electromagnetic and gravitational waves by Kerr black holes

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