  The equation of state (EOS) of high-density matter is still not clear and
several recent observations indicate restrictions to EOSs. Theoretical studies
should thus elucidate EOSs at high density and/or high temperature. Many
theoretical studies have attempted to account for the effect of rotation of
rapidly rotating neutron stars (pulsars), which are commonly observed
astronomical objects having high-density interiors. Furthermore, neutron stars
generate a strong magnetic field. Several recent studies indicate that this
magnetic field exerts some restrictions on the EOS. Theoretical studies should
thus incorporate these effects. In this paper, we focus on the effect of
rotation. We find that one of our EOSs is consistent with these observations,
and another is inconsistent. We also find an important relation between radius
and rotation.
