Understanding the giant flare phenomena with strongly magnetized neutron star models

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We systematically examined the crustal torsional oscillations with the phenomenological equation of state, which are compared with the frequencies of quasi-periodic oscillations in the giant flares observed from soft-gamma repeaters. Then, we succeeded in making a constraint on the nuclear saturation parameter. This is a completely different constraint in quality from that obtained from the terrestrial nuclear experiments, which contributes not only astrophysics but also nuclear physics. We also succeeded in deriving the mass formulas for low-mass neutron stars. The finding of a new combination with nuclear saturation parameters describing neutron stars, enables us to discuss the nuclear physics directly from the neutron star observations.