Darmstadt 2016 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 19: Nuclear Astrophysics III
HK 19.2: Talk
Tuesday, March 15, 2016, 14:30–14:45, S1/01 A02
Isospin-asymmetry expansion of the nuclear equation of state — •Corbinian Wellenhofer1, Jeremy W. Holt2, Norbert Kaiser1, and Wolfram Weise1,3 — 1Technische Universität München — 2University of Washington — 3ECT*
The isospin-asymmetry dependence of the nuclear equation of state obtained from microscopic chiral two- and three-body interactions in many-body perturbation theory is examined in detail. The quadratic, quartic and hexic Maclaurin coefficients in the isospin-asymmetry expansion of the free energy per particle of homogeneous nuclear matter are calculated using finite difference approximations, and the resulting polynomials are compared to the full isospin-asymmetry dependent free energy. It is found that in the low-temperature and high-density regime where the radius of convergence of the isospin-asymmetry expansion is generically zero the inclusion of higher-order terms beyond the leading quadratic approximation leads to a worse description of the full isospin-asymmetry dependence. Only at high temperatures and densities below nuclear saturation density does the inclusion of the quartic and hexic coefficients lead to an improved approximation.