 06336 Kiro Miyazaki
 Constraints on the symmetry energy from neutron star equation of state
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Nov 20, 06

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Abstract. We develop an equation of state (EOS) for neutron star (NS) matter, which forbids the direct URCA cooling and satisfies the recent information on the mass and the radius, simultaneously. At subsaturation densities, the symmetry energy of the EOS is well described by a function E_{sym}(\rho)=31.6(\rho/\rho_0)^{\gamma} with 0.70\leq\gamma\leq0.77. This constraint on the density dependence of the symmetry energy is much severer than that obtained from the analysis of the isospin diffusion date in heavyion collisions. Consequently, we can obtain the valuable information on nuclear matter from the astrophysical observations of NSs.
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