Impact of nonlinear prescriptions and baryonic effects on future weak lensing analyses

Upcoming surveys will map the growth of large-scale structure with unprecedented precision, improving our understanding of the dark sector of the Universe. Unfortunately, much of the cosmological information is encoded by the small scales, where the clustering of dark matter and the effects of astrophysical feedback processes are not fully understood. This can bias the estimates of cosmological parameters. In this talk I will present the recent results obtained within the Euclid Consortium for a joint analysis of Euclid cosmic shear and Planck cosmic microwave background data. I will show the change in constraining power and the biased parameter estimates when using different modelling of both the matter power spectrum and the baryonic feedback. I will then conclude by showing the importance of accurately modelling these effects to properly extract the information from future weak lensing surveys.

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Meeting ID: 850 4491 0172 
Passcode: 996691