06-209 Kiro Miyazaki

Strongly magnetized strange baryonic matter in neutron star (390K, PDF) Jul 24, 06

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Abstract. We investigate the strongly magnetized strange baryonic matter in a relativistic mean-field theory. We first take into account the hidden strange mesons and the field-dependent meson-baryon coupling constants. In low-density region the strongly magnetized neutron star (NS) matter is nearly iso-symmetric. The equation of state (EOS) therefore becomes softer than that of the normal NS matter. Because the magnetic field increases the threshold densities of \Lambda and \Xi^-, the EOS becomes stiffer in high-density region. However, the magnetic field has little effect on the effective masses of \Lambda and \Sigma. Taking into account the anomalous magnetic moments (AMMs) of baryons, the EOS becomes much stiffer although the threshold densities of \Sigma^+, \Sigma^0 and \Xi^0 decrease largely. The density dependence of the effective mass of \Xi precisely reflects the EOS while the effective masses of \Lambda and \Sigma are strongly influenced by the AMMs of nucleons through the scalar mean-field.

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