Weak lensing distortions beyond shear
Abstract
When a luminous source is extended, its distortions by weak gravitational lensing are richer than a mere combination of magnification and shear. In a recent work, we proposed an elegant formalism based on complex analysis to describe and calculate such distortions. The present article further elaborates this finite-beam approach, and applies it to a realistic cosmological model. In particular, the cosmic correlations of image distortions beyond shear are predicted for the first time. These constitute new weak-lensing observables, sensitive to very-small-scale features of the distribution of matter in the Universe. While the major part of the analysis is performed in the approximation of circular sources, a general method for extending it to noncircular sources is presented and applied to the astrophysically relevant case of elliptic sources.
Cite
@article{arxiv.1809.03924,
title = {Weak lensing distortions beyond shear},
author = {Pierre Fleury and Julien Larena and Jean-Philippe Uzan},
journal= {arXiv preprint arXiv:1809.03924},
year = {2019}
}
Comments
14+2 pages, 6 figures