Nuclear excitations: density-functional versus many-body approaches

Wednesday 16 January 2019, 10.00AM

Speaker(s): Gialuca Cola, University of Milan

Abstract

In this talk, I will start with a bird's eye view of the present status of Density Functional Theory (DFT) in nuclear physics. In recent years, the functionals that have been developed have reached a quite high level of sophistication. I will explain the attempts by our group for the improvement of these functionals: we aim at understanding on equal footing both ground-state and excited-state properties. The focus will be on isospin as well as spin-isospin excitations of finite nuclei. I will also touch upon isospin symmetry and its breaking. Finally, a link with the properties of the nuclear equation of state, whose relevance is also related to the recent new signals from neutron stars, will be established.
In the second part of the talk, I will dwell on the comparison between DFT and quantum many-body theory. I will describe our models based on the extension of DFT that take care of further correlations, I will discuss which observables do call for such extension, and draw an analogy with the GW-method for electronic systems. In fact, a stronger cross-fertilisation between the studies of nucleonic and electronic systems will be eventually called for.

Location: P/T111