Mitigating baryonic effects with a theoretical error covariance

Understand

One of the primary sources of uncertainties in modeling the cosmic-shear power spectrum on small scales is the effect of baryonic physics.

• Accurate cosmology for Stage-IV surveys requires knowledge of the matter power spectrum deep in the nonlinear regime at the percent level.
• Therefore, it is important to develop reliable mitigation techniques to take into account baryonic uncertainties if information from small scales is to be considered in the cosmological analysis.
• In this work, we develop a new mitigation method for dealing with baryonic physics for the case of the shear angular power spectrum.