Spin polarized neutron matter within the Dirac-Brueckner-Hartree-Fock approach

Abstract

The relation between energy and density (known as the nuclear equation of state) plays a major role in a variety of nuclear and astrophysical systems. Spin and isospin asymmetries can have a dramatic impact on the equation of state and possibly alter its stability conditions. An example is the possible manifestation of ferromagnetic instabilities, which would indicate the existence, at a certain density, of a spin-polarized state with lower energy than the unpolarized one. This issue is being discussed extensively in the literature and the conclusions are presently very model dependent. We will report and discuss our recent progress in the study of spin-polarized neutron matter. The approach we take is microscopic and relativistic. The calculated neutron matter properties are derived from realistic nucleon-nucleon interactions. This makes it possible to understand the nature of the EOS properties in terms of specific features of the nuclear force model.

6 pages, 11 figures, revised/extended calculations

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• Neutron Fermi Liquids under the presence of a strong magnetic field with effective nuclear forces
• Study of spin polarized nuclear matter and finite nuclei with finite range simple effective interaction
• Unusual temperature behavior of entropy of antiferromagnetic spin state in nuclear matter with effective finite range interaction
• Finite temperature effects on spin polarization of neutron matter in a strong magnetic field
• Spin- and isospin-polarized states of nuclear matter in the Dirac-Brueckner-Hartree-Fock model
• Spin-polarized low-density neutron matter
• Phase transition to the state with nonzero average helicity in dense neutron matter
• Hot and highly magnetized neutron star matter properties with Skyrme interactions