2009, Vol.12, No.4, pp.356-360
Spin polarized states in neutron matter at strong magnetic
fields up to 1018 G are considered in the model with the
Skyrme effective interaction. Analyzing the self-consistent
equations at zero temperature, it is shown that a
thermodynamically stable branch of solutions for the spin
polarization parameter as a function of density corresponds to the
negative spin polarization when the majority of neutron spins are
oriented oppositely to the direction of the magnetic field.
Besides, it is found that
in a strong magnetic field the state with the positive spin polarization can be realized as a
metastable state at the high density region in neutron matter. At
finite temperature, the entropy of the thermodynamically stable
branch demonstrates the unusual behavior being greater than that
for the nonpolarized state (at vanishing magnetic field) above
certain critical density which is caused by the dependence of the
entropy on the effective masses of neutrons in a spin polarized
state.
Key words:
Neutron star models, magnetar, neutron matter, Skyrme
interaction, strong magnetic field, spin polarization
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