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Algebraic diagrammatic construction formalism with three-body interactions

Raimondi, Francesco and Barbieri, Carlo (2018) Algebraic diagrammatic construction formalism with three-body interactions Physical Review C, 97 (5), 054308.

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Abstract

Background:

Self-consistent Green’s function theory has recently been extended to the basic formalism needed to account for three-body interactions [A. Carbone, A. Cipollone, C. Barbieri, A. Rios, and A. Polls, Phys. Rev. C 88, 054326 (2013)]. The contribution of three-nucleon forces has then been included in ab initio calculations on nuclear matter and isotopic chains of finite nuclei.

Purpose:

ractical applications across post Hartree-Fock methods have mostly considered the contribution of three-nucleon interactions in an effective way, as averaged two-nucleon forces. We derive the working equations for all possible two- and three-nucleon terms that enter the expansion of the self-energy, including interactionirreducible (i.e. not averaged) three-nucleon diagrams.

Methods:

We employ the algebraic diagrammatic construction up to third order as the organization scheme for generating a non perturbative self-energy, in which ring (particle-hole) and ladder (particle-particle) diagrams are resummed to all orders.

Results:

We derive expressions of the static and dynamic self-energy up to third order, by taking into account also the set of diagrams required when the skeleton expansion of the single-particle propagator is not assumed. A hierarchy of importance among different diagrams is revealed, and a particular emphasis is given to a third-order diagram (see Fig. 2c) which is expected to play a significant role among those featuring an interaction-irreducible three-nucleon force.

Conclusion:

A consistent formalism to resum at infinite order correlations induced by three-nucleon forces in the self-consistent Green’s function theory is now available, and ready to be implemented in the many-body solvers. Work is in progress to include the first interaction-irreducible three-nucleon diagram in calculations of closed-shell medium-mass nuclei.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Raimondi, Francescof.raimondi@surrey.ac.uk
Barbieri, CarloC.Barbieri@surrey.ac.uk
Date : 8 May 2018
DOI : 10.1103/PhysRevC.97.054308
Copyright Disclaimer : Copyright 2018 American Physical Society
Depositing User : Melanie Hughes
Date Deposited : 08 May 2018 11:30
Last Modified : 12 Aug 2018 23:37
URI: http://epubs.surrey.ac.uk/id/eprint/846364

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