Quasiparticle interaction in nuclear matter with chiral three-nucleon forces

We derive the effective interaction between two quasiparticles in symmetric nuclear matter resulting from the leading-order chiral three-nucleon force. We restrict our study to the L = 0, I Landau parameters of the central quasiparticle interaction computed to first order. We find that the three-nucleon force provides substantial repulsion in the isotropic spin-and isospin-independent component F-0 of the interaction. This repulsion acts to stabilize nuclear matter against isoscalar density oscillations, a feature which is absent in calculations employing low-momentum two-nucleon interactions only. We find a rather large uncertainty for the nuclear compression modulus kappa due to a sensitive dependence on the low-energy constant c(3). The effective nucleon mass M* on the Fermi surface, as well as the nuclear symmetry energy beta, receive only small corrections from the leading-order chiral three-body force. Both the anomalous orbital g-factor delta g(1) and the Landau-Migdal parameter g '(NN) (characterizing the spin isospin response of nuclear matter) decrease with the addition of three-nucleon correlations. In fact, delta g(1) remains significantly smaller than its value extracted from experimental data, whereas g '(NN) still compares well with empirical values. The inclusion of the three-nucleon force results in relatively small p-wave (L = 1) components of the central quasiparticle interaction, thus suggesting an effective interaction of short range. 2011 Elsevier B.V. All rights reserved.