Product Description
by Marcus C. Werner (Guest Editor)
The year 2019 saw the centenary of Eddington's eclipse expeditions and the corroboration of Einstein's general relativity by gravitational lensing. To mark the occasion, a Special Issue of Universe has been dedicated to the theoretical aspects of strong gravitational lensing. The articles assembled in this volume contain original research and reviews and apply a variety of mathematical techniques that have been developed to study this effect, both in 3-space and in spacetime. These include: - Mathematical properties of the standard thin lens approximation, in particular caustics; - Optical geometry, the Gauss-Bonnet method and related approaches; - Lensing in the spacetime of general relativity and modified theories; black hole shadows.
