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This is the abstract: Understanding how galaxies form and evolve remains one of the central challenges in modern astrophysics. In this talk, I will present my research over the past decade on the multi-scale processes that govern galaxy formation, from the initial conditions imprinted in the cosmic microwave background to the assembly of galactic disks.

I will show that the effect of the cosmic environment on galaxy formation is not purely stochastic. Instead, anisotropic large-scale structures—the filaments, walls, and voids of the cosmic web—exert coherent, directional influences that imprint themselves on halo assembly, mass accretion, and especially angular momentum. This influence can, to a surprising extent, be captured using analytical frameworks grounded in the initial density field and the dynamics of critical points.

The circumgalactic medium (CGM) emerges as a key mediator in this cascade, translating the large-scale structure’s influence into the conditions for star formation within galaxies. Understanding its thermodynamic and kinematic state is therefore essential, and represents one of the current frontiers in the field. I will highlight recent results from large-scale simulations that probe the interplay between the CGM and galactic morphology, including the MEGATRON projects.

Finally, I will discuss our ongoing efforts to develop Dyablo, a next-generation simulation code designed to meet the challenges of this new regime. In an era where no single researcher can span the full simulation pipeline alone, Dyablo exemplifies a paradigm shift: from monolithic codebases to collaborative, interoperable infrastructures built for community-scale science.

BIO

Dr. Corentin Cadiou recieved his PhD in 2019 at the Institut Astrophysique de Paris (IAP) under the supervision of Prof. Christophe Pichon and Prof. Yohan Dubois. For his first postdoc he moved to the University College London (UCL) to work with Prof. Andrew Pontzen until 2022, when he moved to Lund Unversity for his second postdoc with Prof. Oscar Agertz. In 2025 he went back to the IAP to start his permanent position as "chargé de recherche" for the Centre National de la Recherche Scientifique (CNRS). Dr. Corentin Cadiou is an expert in numerical techniques applied in cosmological galaxy formation simulations, e.g. tracer particle implementation, genetic modifications, splicing techniques. His work focuses on CGM physics and angular momentum acquisition as a function of cosmic time, and he is also one of the PIs of the MEGATRON suite of simulations.

Host: Alvaro