Research (WORK IN PROGRESS)

My research interests embrace various aspects of the formation of galaxies at high redshift. I spend most of my (research) time thinking about the Epoch of Reionisation: this correspond to the first billion years of the Universe, during which massive stars and active galactic nuclei (AGN) shine and ionise the surrounding Intergalactic Medium (IGM). I focus on the following broad questions:

• How do early galaxies form their stars, and how are they affected by the subsequent feedback?
• How do massive black holes at the centre of galaxies grow and power AGN, and how does this impact their host?
• How much ionising radiation is produced by these galaxies, and how much of it escapes to reionise the Universe?

I address these questions using cosmological simulations, mostly with the AMR code RAMSES. Since 2023, RAMSES is officially recognised by the French CNRS as a “community code”, and I actively participate to the corresponding service d’observation.

While primarily working with simulations, I am deeply convinced that our theoretical understanding of the Universe heavily relies on careful comparison with observations. For this, I have (co-)developped tools to create synthetic observations from simulations, such as the RASCAS radiative transfer code.

I am also leading a large simulation project called Obelisk designed to model the formation of a protocluster environment until the peak of cosmic star formation (around z ~ 2). The simulation has been applied to multiple studies, including quantifying the relative contribution of galaxies and AGN to cosmic reionisation, Lyman-α radiative transfer, black hole mergers in the early Universe, and the properties of Little Red Dots observed by JWST.