Signatures of isovector components of the scalar sigma-meson in neutron stars

摘要

Based on non-crossed, crossed and correlated pipi exchanges with irreducible N, Delta intermediate states, we predict an isovector component for the sigma meson. We study dense hadronic matter in a generalized relativistic mean field approach with nonlinear self-couplings of the I = 0, 1 components of the scalar field and compare its predictions for neutron star properties with results from different models found in the literature.