Towards solving model bias in cosmic shear forward modeling. (arXiv:2210.16243v1 [astro-ph.CO])

As the volume and quality of modern galaxy surveys increase, so does the
difficulty of measuring the cosmological signal imprinted in galaxy shapes.
Weak gravitational lensing sourced by the most massive structures in the
Universe generates a slight shearing of galaxy morphologies called cosmic
shear, key probe for cosmological models. Modern techniques of shear estimation
based on statistics of ellipticity measurements suffer from the fact that the
ellipticity is not a well-defined quantity for arbitrary galaxy light profiles,
biasing the …

arxiv astro bias model bias modeling