Sandi Setiawan, Tom G. Mackay, Akhlesh Lakhtakia
Published 2005-04-15, updated 2006-11-23Version 3
The propagation of electromagnetic plane waves with negative phase velocity (NPV) in the ergosphere of a rotating black hole has recently been reported. A comparison of NPV propagation and superradiance is presented. We show that, although both phenomenons involve negative energy densities, there are two significant differences between them.
Comments: Figure 2 in the version published in Phys Lett A is corrected in the arxiv version
Journal: Phys.Lett. A341 (2005) 15-21; Erratum-ibid. A361 (2007) 529-533
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