Black hole superradiance and polarization-dependent bending of light [CL]

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.

Read this paper on arXiv…

A. Plascencia and A. Urbano
Thu, 23 Nov 17

Comments: Bulk of 29 pages + 11 figures