Metamorphoses of a photon sphere
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DOI: 10.1103/physrevd.96.084056
Abstract: There are circular planar null geodesics at $r=3M$ around a Schwarzschild black hole of mass $M$. These geodesics form a photon sphere. Null geodesics of the Schwarzschild space-time which do not form the photon sphere… read more here.
Keywords: photon; black hole; photon sphere; null geodesics ... See more keywords