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HK: Fachverband Physik der Hadronen und Kerne
HK 62: Structure and Dynamics of Nuclei XI
HK 62.1: Group Report
Thursday, March 31, 2022, 14:00–14:30, HK-H7
Extension and acceleration of the in-medium similarity renormalization group — •Matthias Heinz1,2,3, Jan Hoppe1,2, Alexander Tichai1,2,3, Kai Hebeler1,2,3, and Achim Schwenk1,2,3 — 1Technische Universität Darmstadt, Department of Physics — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH — 3Max-Plank Institut für Kernphysik, Heidelberg
The ab initio solution of the nuclear many-body problem for theoretical predictions of nuclear structure observables is a computationally challenging endeavor. Over the past decade, the in-medium similarity renormalization group (IMSRG) has been established as an important method capable of describing a broad range of nuclei up to mass numbers around 100 and beyond, including open-shell systems via different extensions of the method.
A key (as of yet unrealized) milestone in the IMSRG is the relaxation of the many-body truncation of the method, currently restricted to the normal-ordered two-body level, the IMSRG(2). We discuss studies of the next truncation, the IMSRG(3), in small systems and restricted model spaces. We additionally highlight recent developments to accelerate IMSRG calculations that might make the IMSRG(3) more feasible, including basis optimization via natural orbitals and importance truncation applied to the IMSRG.
* Funded by the ERC Grant Agreement No. 101020842 and by the DFG – Project-ID 279384907 – SFB 1245.