Tootfinder

Nulling baryonic feedback in weak lensing surveys using cross-correlations with fast radio bursts
Calvin Leung, Josh Borrow, Kiyoshi W. Masui, Shion Andrew, Kai-Feng Chen, Joop Schaye, Matthieu Schaller
https://arxiv.org/abs/2509.19514

Nulling baryonic feedback in weak lensing surveys using cross-correlations with fast radio bursts
Baryonic feedback is a leading contaminant in studying dark matter and cosmology using cosmic shear. This has meant omitting much of the data during cosmological inference, or forward-modeling the spatial distribution of gas around dark matter halos using analytical or hydrodynamical models for baryonic feedback, which introduces nuisance parameters and model dependence. We propose a novel method of ``baryon nulling'' using cross-correlations between shear maps and fast radio burst (FRB) disper…