DeCAF Seminar Series:

Abstract: Feedback plays a key role in galaxy formation, especially through energy injection from supernovae and active galactic nuclei (AGN), which are thought to be major regulators of star formation. In cosmological simulations, however, it is computationally infeasible to resolve such small-scale physics across cosmological volumes, so subgrid models are employed. These models introduce significant uncertainty, and many efforts have been made to improve them. In the CROCODILE simulation project, we developed the GADGET4-Osaka code with a supernova feedback model based on high-resolution superbubble simulations and a thermal AGN feedback model. The CROCODILE simulations have successfully reproduced key galaxy statistics, such as the galaxy stellar mass function. We are now participating in the The300 cosmological galaxy cluster simulation project using GADGET4-Osaka with the updated CROCODILE-2 subgrid model, which includes radio-jet AGN feedback and an improved black hole accretion model. In this talk, I will present the CROCODILE-2 model and some initial results.

Speaker Bio: Yuri Oku is an ILR Fellow at the University of Osaka. He received his PhD in 2024 from the University of Osaka and spent two years as a postdoctoral research associate at Zhejiang University before joining the University of Osaka in 2026. His research focuses on hydrodynamical simulations of galaxy formation to understand feedback processes in hierarchical structure formation in the Universe.