Speaker
Description
Extracting precise cosmology from weak lensing surveys requires modelling the non-linear matter power spectrum, which is suppressed at small scales due to baryonic feedback processes. However, hydrodynamical galaxy formation simulations make widely varying predictions for the amplitude and extent of this effect. Given the recent indications from weak lensing and kinematic Sunyaev-Zel’dovich measurements of a feedback scenario that is more extreme than many hydrodynamical simulations implement, the question remains of whether this scenario is physical and could be reproduced in a simulation that predicts a realistic Universe with respect to observations. I will discuss work exploring a range of empirical AGN feedback models within the FABLE cosmological simulation suite, and highlight an empirical AGN feedback mechanism that is able to produce a greater matter power suppression than fiducial FABLE in agreement with WL+kSZ constraints, whilst maintaining good agreement with all key galaxy, galaxy group, and cluster properties. DESI is delivering kSZ measurements forecasted to have an eight-fold improvement in signal-to-noise and therefore powerful constraining power for baryonic physics. To maximise the return, it is crucial results are validated in a model-independent manner, and therefore that a complementary tool to 'baryonification' exists for WL + kSZ analyses. I will share our development of a hydrodynamical simulation-based emulator for the dependence of the kSZ signal on baryonic feedback processes, and insights from measurements of the kSZ effect in a number of state-of-the-art hydrodynamical simulations. Finally, I will share first constraints on both cosmology and astrophysics from a joint analysis of the DES Y3 cosmic shear and DESI Y1 + ACT kSZ datasets.
| Would you be interested in presenting a poster if the conference is oversubcribed? | Yes |
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