
Formation and evolution of galaxies
- Studies in reionisation and galaxies of the distant Universe.
- with deep observations exploiting most available facilities (notably VLT/MUSE, HST, ALMA) and gravitational lensing amplification (e.g. with Frontier Fields),
- with semi-analytic models specialised for high-z galaxy populations (GALICS),
- with cosmological radiation-hydrodynamic simulations of the first galaxies (RAMSES). Radiative transfer of ionising radiation and of the Lyman-alpha line (MCLya).
- Studies of the resolved properties of low-mass galaxies, either distant or local
- in observing distant gravitationnally lensed objects,
- in analysing and modelling the physical properties and stellar populations of local galaxies, notably using HyperLEDA.

Observational cosmology
- Large extragalactic surveys (EUCLID, 4MOST)
- Supernovae surveys (SNFactory) and standardisation of SN Ia
- Clusters of galaxies

Scientific support and exploitation for instrumental projects at CRAL
- ESO-VLT/MUSE
- ESA-JWST/NIRSpec
- ESO-VISTA/4MOST
- ESO-ELT/HARMONI
- UH2.2-IfA/SNIFS