Journal
CLASSICAL AND QUANTUM GRAVITY
Volume 33, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0264-9381/33/7/075006
Keywords
photon spheres; electrostatic; asymptotically flat
Categories
Funding
- Baden-Wurttemberg Stiftung by Eliteprogramme for Postdocs
- NSF [DMS-1313724]
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In a recent paper (Cederbaum C and Galloway G J 2015 Commun. Analysis Geom. at press), the authors established the uniqueness of photon spheres in static vacuum asymptotically flat spacetimes by adapting Bunting and Masood-ul-Alam's proof of static vacuum black hole uniqueness. Here, we establish uniqueness of suitably defined sub-extremal photon spheres in static electro-vacuum asymptotically flat spacetimes by adapting the argument of Masood-ul-Alam (1992 Class. Quantum Grav. 9 L53-5). As a consequence of our result, we can rule out the existence of electrostatic configurations involving multiple 'very compact' electrically charged bodies and sub-extremal black holes.
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