Kavli Affiliate: Kiyoshi W. Masui
| First 5 Authors: Calvin Leung, Calvin Leung, , ,
| Summary:
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) dispersion measures. By directly subtracting
the dark matter–dispersion measure cross-correlation, the sensitivity of our
nulled power spectra to feedback effects can be significantly reduced without
any explicit feedback modeling. Using the FLAMINGO suite of hydrodynamic
simulations, whose power spectra span a wide yet realistic range of feedback
variations, we demonstrate that our method reduces sensitivity to feedback
modeling at $k approx 1$ Mpc$^-1$ by about an order of magnitude. This
points toward a strong synergy between the next generation of sensitive FRB
surveys such as CHORD and the DSA-2000, and cosmic shear surveys such as Rubin,
Euclid, and Roman.
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