Asymmetric nuclear matter in a Hartree-Fock approach to nonlinear quantum hadrodynamics

The equation of state (EOS) for asymmetric nuclear matter is discussed starting from a phenomenological hadronic field theory of Serot-Walecka type including exchange terms. In a model with self-interactions of the scalar sigma meson we show that the Fock terms naturally lead to isospin effects in the nuclear EOS. These effects are quite large and lead to a density dependence of the isovector couplings. We obtain a potential symmetry term of ``stiff'' type, i.e., increasing with baryon density and an interesting behavior of neutron-proton effective masses of relevance for transport properties of asymmetric dense matter.

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