Uniqueness of static photon surfaces: Perturbative approach
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DOI: 10.1103/physrevd.95.044047
Abstract: A photon surface $S$ is defined as a three-dimensional timelike hypersurface such that any null geodesic initially tangent to $S$ continues to be included in $S$, like $r=3M$ of the Schwarzschild spacetime. Using analytic solutions… read more here.
Keywords: photon; photon surface; uniqueness static; static photon ... See more keywords