Hybrid stars: spin-polarized nuclear matter and density-dependent quark masses.

Details Hybrid stars: spin-polarized nuclear matter and density-dependent quark masses. Hybrid stars: spin-polarized nuclear matter and density-dependent quark masses.

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phrvd..57.3242m&link_type=abstract

Physical Review D, Vol. 57, No. 6, p. 3242 - 3255

Physics

1

Stellar Structure: Stellar Interiors, Stellar Interiors: Quark Matter, Equation Of State: Quark Matter

Scientific paper

The possibility of the formation of a droplet phase (DP) inside a star and its consequences on the structural properties of the star are investigated. For nuclear matter, an equation of state (EOS) based on a finite-range, momentum and density-dependent (FRMDD) interaction, which predicts that neutron matter undergoes a ferromagnetic transition at densities realizable inside the neutron star, is employed. An EOS for quark matter with density-dependent quark masses, the so-called effective mass model, is constructed by correctly treating the quark chemical potentials. A comparative study of hybrid star properties as obtained within the usual bag model and the effective mass model shows that both these models yield similar results. Then the effect of spin polarization on the formation of the DP is investigated. Using the EOS based on the FRMDD interaction along with the usual bag model, it is also found that a droplet phase consisting of strange quark matter and unpolarized nuclear matter sandwiched between a core of polarized nuclear matter and a crust containing unpolarized nuclear matter exists.

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