Köln 2025 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 23: Poster
HK 23.33: Poster
Dienstag, 11. März 2025, 17:30–19:00, Foyer Physik
Triples extension to Bogoliubov Coupled Cluster theory — •Urban Vernik1,2, Pepijn Demol4, Alexander Tichai1,2,3, and Thomas Duguet5 — 1Technische Universität Darmstadt, Department of Physics — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH — 3Max-Planck Institut für Kernphysik, Heidelberg — 4KU Leuven, Instituut voor Kern- en Stralingsfysica — 5IRFU, CEA, Université Paris-Saclay
The field of ab initio many-body nuclear physics is advancing steadily, enabling the description of heavier and more exotic nuclei. A key factor is the improved understanding of symmetry breaking in singly open-shell nuclei, which inspired new many-body methods like the Bogoliubov coupled-cluster (BCC). BCC leverages U(1) global gauge symmetry breaking to calculate semi-magic isotopic chains.
BCC calculations are defined by truncation of the cluster operator. Previous implementations were limited to singles and doubles (BCCSD). This work extends the method to include triple excitations, developing BCCSDT. While full self-consistent triples remain computationally prohibitive, approximate non-iterative corrections systematically account for their effects on nuclear observables.
These approximations are implemented in large model spaces for realistic calculations. Applications to the oxygen and calcium isotopic chains demonstrate improved binding energy accuracy. Including triples in BCC thus represents a step forward, offering enhanced predictive power for nuclear observables in semi-magic nuclei.
*Funded by LOEWE Top Professorship
Keywords: Ab initio nuclear structure; Bogoliubov coupled cluster theory; Approximate triples; Oxygen and calcium binding energies