Asymmetric nuclear matter in a Hartree-Fock approach to non-linear QHD

Abstract

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 dominate over the contribution due to isovector mesons. We obtain a potential symmetry term of "stiff" type, i.e. increasing with baryon density and an interesting behaviour of neutron/proton effective masses of relevance for transport properties of asymmetric dense matter.

12 pages (LATEX), 3 Postscript figures, revised version

References in corpus (4)

• Neutron Star Structure and the Neutron Radius of 208Pb
• Asymmetric Nuclear Matter from Extended Brueckner-Hartree-Fock Approach
• Neutron-Proton Differential Flow as a Probe of Isospin-Dependence of Nuclear Equation of State
• Fock exchange terms in non-linear Quantum Hadrodynamics

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• A New Approach to Physics of Nuclei
• On the Isovector Channels in Relativistic Point Coupling Models within the Hartree and Hartree-Fock Approximations
• QCD Sum Rules Description of Nucleons in Asymmetric Nuclear Matter
• Probing the symmetry energy at high baryon density with heavy ion collisions
• On the spin-isospin decomposition of nuclear symmetry energy