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Abstract: We study the equation of state EOS of nuclear matter at subnuclear densityin a Virial expansion for a nonideal gas. The gas consists of neutrons,protons, alpha particles, and 8980 species of nuclei with $A \ge 12$ and massesfrom the finite-range droplet model FRDM. At very low density, the Virialexpansion reduces to nuclear statistical equilibrium. At higher density, theVirial results match smoothly to the relativistic mean field results discussedin our previous paper. We tabulate the resulting EOS at over 73,000 grid pointsin the temperature range $T$ = 0.158 to 15.8 MeV, the density range $n B$ =10$^{-8}$ to 0.1 fm$^{-3}$, and the proton fraction range $Y P$ = 0.05 to 0.56.In the future we plan to match these low density results to our earlier highdensity mean field results, and generate a full EOS table for use in supernovaand neutron star merger simulations. This Virial EOS is exact in the lowdensity limit.



Autor: G. Shen, C. J. Horowitz, S. Teige

Fuente: https://arxiv.org/







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