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HK: Fachverband Physik der Hadronen und Kerne
HK 79: Nukleare Astrophysik
HK 79.1: Gruppenbericht
Donnerstag, 7. März 2013, 16:45–17:15, HSZ-403
Equation of state constraints based on chiral effective field theory interactions⋆ — •Ingo Tews1,2, Thomas Krüger1,2, Kai Hebeler3, and Achim Schwenk2,1 — 1Institut für Kernphysik, Technische Universität Darmstadt — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH — 3Department of Physics, The Ohio State University, Columbus, USA
Neutron matter presents a unique system for chiral effective field theory (EFT), because all many-body forces among neutrons are predicted to next-to-next-to-next-to-leading order (N3LO). We present the first complete N3LO calculation of the neutron matter energy. This includes the subleading three-nucleon (3N) forces for the first time and all leading four-nucleon (4N) forces. Our results provide constraints for the equation of state of neutron-rich matter in astrophysics and for the properties of neutron stars, with controlled theoretical uncertainties.
⋆This work was supported by the ERC Grant No. 307986 STRONGINT, by the DFG through Grant SFB 634, and by the Helmholtz Alliance HA216/EMMI.