Schwarzschild Lensing From Geodesic Deviation

Abstract

We revisit the gravitational lensing of light or gravitational waves by Schwarzschild black hole in geometric optics. Instead of a single massless particle, we investigate the collective behavior of a congruence of light/gravitational rays, described by the geodesic deviation equation (GDE). By projecting on the Newman-Penrose tetrad, GDE is decoupled, and we find an analytical Dyson-like series solution in the weak deflection and thin lens limits. Based on such a solution, we study the evolution of cross-sectional area and axis ratio. Finally, we reproduce the magnification and axis ratio of the lensing images up to the second order of weak deflection approximation and improve some missing corrections in previous works.

17 pages, 5 figures

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Cited by in corpus (4)

• Rigorous calculation of scalar scattering in Schwarzschild background: the convergence of partial-wave series and Poisson spot
• Spinoptics in the Kerr Spacetime: Polarized Wave Scattering
• The precession of particle spin in spherical symmetric spacetimes
• Strong deflection of massive particles via the geodesic deviation equation