Uniqueness of photon spheres in electro-vacuum spacetimes

Carla Cederbaum, Gregory J Galloway

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number075006
JournalClassical and Quantum Gravity
Volume33
Issue number7
DOIs
StatePublished - Mar 7 2016

Keywords

  • asymptotically flat
  • electrostatic
  • photon spheres

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Uniqueness of photon spheres in electro-vacuum spacetimes'. Together they form a unique fingerprint.

  • Cite this