Black hole superradiance and polarization-dependent bending of light

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Published 27 April 2018 © 2018 IOP Publishing Ltd and Sissa Medialab
, , Citation Alexis D. Plascencia and Alfredo Urbano JCAP04(2018)059 DOI 10.1088/1475-7516/2018/04/059

1475-7516/2018/04/059

Abstract

An inhomogeneous pseudo-scalar field configuration behaves like an optically active medium. Consequently, if a light ray passes through an axion cloud surrounding a Kerr black hole, it may experience a polarization-dependent bending. We explore the size and relevance of such effect considering both the QCD axion and a generic axion-like particle.

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10.1088/1475-7516/2018/04/059