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. DESI is now delivering kSZ measurements forecasted to have an eight-fold improvement in signal-to-noise and powerful constraining power for baryonic physics. It is therefore essential that insights into feedback interpreted from these measurements are robust, and that the kSZ effect is established as a benchmark for AGN feedback models in hydrodynamical simulations. In this talk, I will present insights from our analysis of the kSZ signal in five state-of-the-art simulation suites: ANTILLES, FLAMINGO, BAHAMAS, SIMBA, and FABLE. I will discuss the challenges involved in measuring the kSZ signal in simulations, what this implies for interpreting the DESI Y1 measurements, and how these simulations compare to the DESI data. I will finish by sharing our development of a hydrodynamical simulation-based emulator for the dependence of the kSZ signal on baryonic feedback processes.
| Would you be interested in presenting a poster if the conference is oversubcribed? | Yes |
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