Stability of null orbits on photon spheres and photon surfaces
Sign Up to like & getrecommendations! Published in 2019 at "Physical Review D"
DOI: 10.1103/physrevd.100.064040
Abstract: Stability of a photon sphere, or stability of circular null geodesics on the sphere, plays a key role in its applications to astrophysics. For instance, an unstable photon sphere is responsible for determining the size… read more here.
Keywords: null geodesics; surface; stability; photon sphere ... See more keywords
Gravitational lensing by two photon spheres in a black-bounce spacetime in strong deflection limits
Sign Up to like & getrecommendations! Published in 2021 at "Physical Review D"
DOI: 10.1103/physrevd.104.064022
Abstract: We investigate gravitational lensing by a primary photon sphere which is formed by unstable circular light orbits, and by a secondary photon sphere on a wormhole throat in a black-bounce spacetime which is suggested in… read more here.
Keywords: gravitational lensing; black bounce; bounce spacetime; photon sphere ... See more keywords
Retrolensing by light rays slightly inside and outside of a photon sphere around a Reissner-Nordström naked singularity
Sign Up to like & getrecommendations! Published in 2022 at "Physical Review D"
DOI: 10.1103/physrevd.105.024009
Abstract: We investigate retrolensing of sun lights reflected by a photon sphere around a Reissner-Nordström naked singularity. We apply the deflection angles of light rays reflected by slightly outside the photon sphere and rays reflected by… read more here.
Keywords: sphere around; around reissner; photon sphere; naked singularity ... See more keywords
Metamorphoses of a photon sphere
Sign Up to like & getrecommendations! Published in 2017 at "Physical Review D"
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