The SIEP+XS_|| model supplies an analytic forward mapping from source to image plane for gravitational lensing, offering large speed gains and geometric checks but with an inflexible elliptical equipotential.
What Makes Quadruply Lensed Quasars Quadruple? Astrophys
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A Forward, Analytic, Differentiable, Geometric (But Inflexible) Lens Model
The SIEP+XS_|| model supplies an analytic forward mapping from source to image plane for gravitational lensing, offering large speed gains and geometric checks but with an inflexible elliptical equipotential.