Depletion of the nuclear Fermi sea

TL;DR

This paper uses a self-consistent Green's function approach to analyze how short-range and tensor forces deplete low-momentum states in nuclear matter, revealing their dependence on temperature, density, and isospin.

Contribution

It provides an -initio analysis of Fermi sea depletion considering short-range and tensor correlations, with detailed dependence on physical conditions.

Findings

Depletion of the Fermi sea varies with temperature, density, and isospin.

Short-range and tensor forces significantly influence low-momentum state depletion.

The momentum distribution relates to the self-energy components, improving interpretation.

Abstract

The short-range and tensor components of the bare nucleon-nucleon interaction induce a sizeable depletion of low momenta in the ground state of a nuclear many-body system. The self-consistent Green's function method within the ladder approximation provides an \textit{ab-initio} description of correlated nuclear systems that accounts properly for these effects. The momentum distribution predicted by this approach is analyzed in detail, with emphasis on the depletion of the lowest momentum state. The temperature, density, and nucleon asymmetry (isospin) dependence of the depletion of the Fermi sea is clarified. A connection is established between the momentum distribution and the time-ordered components of the self-energy, which allows for an improved interpretation of the results. The dependence on the underlying nucleon-nucleon interaction provides quantitative estimates of the importance of short-range and tensor correlations in nuclear systems.