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gr-qc2000★ 4 cited
Classification of image distortions in terms of Petrov types
Thoralf Chrobok, Volker Perlick
An observer surrounded by sufficiently small spherical light sources at a fixed distance will see a pattern of elliptical images distributed over the sky, owing to the distortion e…
gr-qc2000★ 18 cited
Global properties of gravitational lens maps in a Lorentzian manifold setting
Volker Perlick
In a general-relativistic spacetime (Lorentzian manifold), gravitational lensing can be characterized by a lens map, in analogy to the lens map of the quasi-Newtonian approximation…