## Abstract

Linear density response functions are calculated for symmetric nuclear matter of normal density by time-evolving two-time Green's functions in real time. Of particular interest is the effect of correlations. The system is therefore initially time-evolved with a collision term calculated in a direct Born approximation until fully correlated. An external time-dependent potential is then applied. The ensuing density fluctuations are recorded to calculate the density response. This method was previously used by Kwong and Bonitz for studying plasma oscillations in a correlated electron gas. The energy-weighted sum-rule for the response function is guaranteed by using conserving self-energy insertions as the method then generates the full vertex-functions. These can alternatively be calculated by solving a Bethe -Salpeter equation as done in works by Bozek et al. The (first order) mean field is derived from a momentum-dependent (non-local) interaction while 2^{nd} order self-energies are calculated using a particle-hole two-body effective (or residual) interaction given by a gaussian local potential. We show results of calculations of the response function S(,q_{0} ) for q_{0} = 0.2, 0.4 and 0.8fm ^{-1}. Comparison is made with the nucleons being un-correlated i.e. with only the first order mean field included. We discuss the relation of our work with the Landau quasi-particle theory as applied to nuclear systems by Babu and Brown and followers.

Original language | English (US) |
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Article number | 012011 |

Journal | Journal of Physics: Conference Series |

Volume | 696 |

Issue number | 1 |

DOIs | |

State | Published - Apr 12 2016 |

Event | 6th Interdisciplinary Conference on Progress in Non-Equilibrium Green's Functions, PNGF 2015 - Lund, Sweden Duration: Aug 17 2015 → Aug 21 2015 |

## ASJC Scopus subject areas

- General Physics and Astronomy