Asymmetric nuclear matter and neutron star properties
  We calculate properties of neutron stars such as mass and radius using a relativistic Dirac-Brueckner-hartree-Fock apprach for asymmetric nuclear matter. For pure neutron matter we find the maximum mass to be 2.4 solar masses with a radius of 12 km. For a proton fraction of 30% we find a max mass of 2.1 solar masses and a radius of 10.5 km. The implications are discussed. 
L. Engvik, M. Hjorth-Jensen, E. Osnes, G. Bao and E. Oestgaard