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.
Locating Centers of Clusters of Galaxies with Quadruple Images: Witt’s Hyperbola and a New Figure of Merit.arXiv 2025
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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.