Research Fellow at the University of Surrey since 2018, I recently graduated as a doctor in theoretical nuclear physics from Université Paris-Saclay after three years spent at CEA (2015-2018). My current research interest is about the development of a quantum many-body theory to understand nuclear matter and how they shape neutron stars. Among the challenges toward this goal are the development of a theory capable to account for strong correlations between nucleons. This manifests phenomenologically via a superfluid behaviour, a short-range hard-core interaction and via the existence of numerous bound-states. To face those challenges, theoretical tools I am working on are spontaneous symmetry-breaking, effective field theory and resummation of Feynman diagrams.