On the effective density dependence of vertex functionals in relativistic hadron field theory

Abstract

The effective density-dependent mean-field model of relativistic hadron field theory is applied to calculate properties of symmetric and pure neutron nuclear matter. In order to examine the reliability and behaviour of high- and low-density model extrapolations outside the region of underlying theory, new functional forms of meson–nucleon vertex functionals are proposed. Different functional classes of density dependence are used to parameterize the Dirac–Brueckner–Hartree–Fock calculations to establish an effective approach. Various models are then compared, and implications on the equation of state of nuclear matter and compact stars are discussed. Our results show that the choice of the specific density dependence of couplings has significant effects on high-density calculations.