Modeling baryonic physics in future weak lensing surveys

Understand

Modifications of the matter power spectrum due to baryonic physics are one of the major theoretical uncertainties in cosmological weak lensing measurements.

• Developing robust mitigation schemes for this source of systematic uncertainty increases the robustness of cosmological constraints, and may increase their precision if they enable the use of information from smaller scales.
• Here we explore the performance of two mitigation schemes for baryonic effects in weak lensing cosmic shear: the PCA method and the halo-model approach in \textsc{HMcode}.
• We construct mock tomographic shear power spectra from four hydrodynamical simulations, and run simulated likelihood analyses with \textsc{CosmoLike} assuming LSST-like survey statistics.