Deflection angle of a light ray reflected by a general marginally unstable photon sphere in a strong deflection limit
Naoki Tsukamoto
Abstract
We investigate the deflection angle in a strong deflection limit for a marginally unstable photon sphere in a general asymptotically flat, static and spherically symmetric spacetime under some assumptions to calculate observables. The deflection angle of a light ray reflected by the marginally unstable photon sphere diverges nonlogarithmically while the one for a photon sphere diverges logarithmically. We apply our formula to a Reissner-Nordstr\"om spacetime and Hayward spacetime.
Topics & Concepts
Deflection (physics)PhysicsPhotonSpacetimePhoton sphereClassical mechanicsObservableDeflection angleRayQuantum mechanicsOpticsSchwarzschild radiusde Sitter–Schwarzschild metricPulsars and Gravitational Waves ResearchAstrophysical Phenomena and ObservationsCosmology and Gravitation Theories