Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-04-09
Astronomy and Astrophysics
Astrophysics
gravitational lensing winter school, Aussois, la vieille Europe, 2003
Scientific paper
Most problems in gravitational lensing require numerical solutions. The most frequent types of problems are (1) finding multiple images of a single source and classifying the images according to their properties like magnification or distortion; (2) propagating light rays through large cosmological simulations; and (3) reconstructing mass distributions from their tidal field. This lecture describes methods for solving such problems. Emphasis is put on using adaptive-grid methods for finding images, issues of spatial resolution and reliability of statistics for weak lensing by large-scale structures, and methodical questions related to shear-inversion techniques.
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