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Bogoliubov many-body perturbation theory for open-shell nuclei

Tichai, Alexander ; Arthuis, Pierre ; Duguet, Thomas ; Hergert, Heiko ; Somà, Vittorio ; Roth, Robert (2022):
Bogoliubov many-body perturbation theory for open-shell nuclei. (Publisher's Version)
In: Physics Letters B, 786, pp. 195-200. Elsevier, ISSN 0370-2693, e-ISSN 1873-2445,
DOI: 10.26083/tuprints-00012722,
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Item Type: Article
Origin: Secondary publication
Status: Publisher's Version
Title: Bogoliubov many-body perturbation theory for open-shell nuclei
Language: English
Abstract:

A Rayleigh–Schrödinger many-body perturbation theory (MBPT) approach is introduced by making use of a particle-number-breaking Bogoliubov reference state to tackle (near-)degenerate open-shell fermionic systems. By choosing a reference state that solves the Hartree–Fock–Bogoliubov variational problem, the approach reduces to the well-tested Møller–Plesset, i.e., Hartree–Fock based, MBPT when applied to closed-shell systems. Due to its algorithmic simplicity, the newly developed framework provides a computationally simple yet accurate alternative to state-of-the-art non-perturbative manybody approaches. At the price of working in the quasi-particle basis associated with a single-particle basis of sufficient size, the computational scaling of the method is independent of the particle number. This paper presents the first realistic applications of the method ranging from the oxygen to the nickel isotopic chains on the basis of a modern nuclear Hamiltonian derived from chiral effective field theory.

Journal or Publication Title: Physics Letters B
Journal volume: 786
Publisher: Elsevier
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Divisions: 05 Department of Physics > Institute of Nuclear Physics
Date Deposited: 25 Mar 2022 13:13
Last Modified: 25 Mar 2022 13:14
DOI: 10.26083/tuprints-00012722
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-127229
Additional Information:

Keywords: Perturbation theory; Many-body theory; Ab initio; Open-shell nuclei

URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/12722
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