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Journal Article

Neutron matter from chiral two- and three-nucleon calculations up to N3LO


Schwenk,  Achim
Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany;
ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum f¨ur Schwerionenforschung GmbH, 64291 Darmstadt, Germany;
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Drischler, C., Carbone, A., Hebeler, K., & Schwenk, A. (2016). Neutron matter from chiral two- and three-nucleon calculations up to N3LO. Physical Review C, 94(5): 054307. doi:10.1103/PhysRevC.94.054307.

Cite as: http://hdl.handle.net/21.11116/0000-0001-D535-3
Neutron matter is an ideal laboratory for nuclear interactions derived from chiral effective field theory since all contributions are predicted up to next-to-next-to-next-to-leading order (N3LO) in the chiral expansion. By making use of recent advances in the partial-wave decomposition of three-nucleon (3N) forces, we include for the first time N3LO 3N interactions in many-body perturbation theory (MBPT) up to third order and in self-consistent Green's function theory (SCGF). Using these two complementary many-body frameworks we provide improved predictions for the equation of state of neutron matter at zero temperature and also analyze systematically the many-body convergence for different chiral EFT interactions. Furthermore, we present an extension of the normal-ordering framework to finite temperatures. These developments open the way to improved calculations of neutron-rich matter including estimates of theoretical uncertainties for astrophysical applications.