Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 54: Nukleare Astrophysik
HK 54.1: Gruppenbericht
Freitag, 21. März 2014, 11:00–11:30, HZ 4
Quantum Monte Carlo Calculations with Chiral Effective Field Theory Interactions⋆ — •Ingo Tews1,2, Kai Hebeler1,2, Achim Schwenk2,1, Alexandros Gezerlis3, and Evgeny Epelbaum4 — 1Institut für Kernphysik, Technische Universität Darmstadt — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH — 3Department of Physics, University of Guelph — 4Institut für Theoretische Physik II, Ruhr-Universität Bochum
We present first quantum Monte Carlo (QMC) calculations with chiral effective field theory (EFT) interactions. To achieve this, we remove all sources of nonlocality, which hamper the inclusion in QMC calculations, in nuclear forces to next-to-next-to-leading order. We perform auxiliary-field diffusion Monte Carlo (AFDMC) calculations for the neutron matter energy up to saturation density based on these local nucleon-nucleon interactions. Our results provide nonperturbative benchmarks with theoretical uncertainties. For the softer interactions, perturbative calculations are in excellent agreement with the AFDMC results. This work paves the way for QMC calculations with systematic chiral EFT interactions for nuclei and nuclear matter, for testing the perturbativeness of different orders, and allows for matching to lattice QCD results by varying the pion mass.
⋆ This work was carried out within the ERC Grant No. 307986 STRONGINT, and also supported by the Helmholtz Alliance Program of the Helmholtz Association contract HA216/EMMI. Computations were performed at the Jülich Supercomputing Center.