GRAVITATIONAL LENSING AND CATASTROPHE THEORY
/ Authors
/ Abstract
Singularities of caustics appearing in the gravitational lensing effect are discussed analytically. The multipole expansion model of the lensing object is mainly studied since it is tractable and universal. Our analyses are confirmed by numerical calculations and applied to the multiple quasar system of PG1115+080. Consistencies with elliptical lens models are also discussed.
Journal: International Journal of Modern Physics D