Multi-reference many-body perturbation theory for nuclei I -- Novel PGCM-PT formalism

Understand

Perturbative and non-perturbative expansion methods already constitute a tool of choice to perform ab initio calculations over a significant part of the nuclear chart.

• In this context, the categories of accessible nuclei directly reflect the class of unperturbed state employed in the formulation of the expansion.
• The present work generalizes to the nuclear many-body context the versatile method of Ref.
• \cite{burton20a} by formulating a perturbative expansion on top of a multi-reference unperturbed state mixing deformed non-orthogonal Bogoliubov vacua, i.e.