Speaker
Description
Understanding the impact of baryonic feedback on the matter distribution is a major challenge for precision cosmology, especially for analyses combining large-scale structure tracers with CMB secondary anisotropies. We recently showed that combining kinematic Sunyaev–Zel’dovich measurements from ACT with gas‑fraction data from eROSITA provides strong constraints on gas thermodynamics in massive halos, with the BFC baryonification framework favoring strong‑feedback models consistent with FLAMINGO.
In the first part of this talk, I will summarize these results and illustrate how combining CMB and X‑ray observables constrains baryonic feedback.
In the second part, I will present our extension of the baryonification framework to full cosmological lightcones. Starting from dark‑matter‑only shells from the CosmoGrid simulation suite, we apply the updated BFC displacement model to generate self‑consistent gas, stellar, and dark‑matter fields, enabling forward‑modeling of multiple observables within a unified framework.
I will then show first results, including high‑resolution thermal and kinematic SZ maps on the HEALPix grid. This approach provides an efficient path from dark‑matter‑only simulations to realistic CMB secondary anisotropies and supports consistent modeling of correlations between LSS tracers and CMB signals.
Finally, I will discuss validation against FLAMINGO and extensions to additional probes such as X‑ray emission and weak‑lensing shear. By jointly modeling LSS tracers with tSZ and kSZ effects, this framework enables unified multi‑probe analyses that constrain both cosmology and baryonic feedback.