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HK: Fachverband Physik der Hadronen und Kerne
HK 5: Structure and Dynamics of Nuclei II
HK 5.1: Group Report
Monday, March 16, 2026, 16:15–16:45, AM 00.021
Emulators for Hartree-Fock and In-Medium Similarity Renormalization Group — •Margarida Companys Franzke1,2,3, Tom Plies1,2, 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-Planck Institut für Kernphysik, Heidelberg
Emulation techniques have become a popular tool in nuclear physics to study Hamiltonians with an explicit parametric dependence. An important example is given by two- and three-nucleon interactions derived from chiral effective field theory that depend linearly on low-energy couplings (LECs). To extensively explore the LEC parameter space even simpler methods like Hartree Fock can become computationally costly, which makes the use of emulators necessary. While methods like Hartree-Fock can be emulated with reduced basis methods like eigenvector continuation, the problem is more complex for in-medium similarity renormalization group calculations. For this, more data-driven approaches like Gaussian Processes are more promising. Funded by the ERC Grant Agreement No. 101020842 and by the DFG - Project-ID 279384907 - SFB 1245.
Keywords: Ab initio; Emulators; Hartree-Fock method; IMSRG