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arXiv 1908.00018astro-ph.HEnucl-th
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由引力波事件测量核对称性能量参数

Measurement of the nuclear symmetry energy parameters from gravitational wave events

Carolyn A. Raithel, Feryal Ozel

摘要:

核对称能在决定地球物质的核性质和中子星的天体物理性质方面起着重要作用。引力波事件GW 170817首次测量了中子星的潮汐形变,提供了一种新的探测对称能的方法。在这项工作中,我们报告的新的约束的对称性能量从GW 170817。我们特别关注的低阶系数:即,在核饱和密度,S_0的对称能的值,和对称能的斜率,L_0。我们发现,引力波数据对S_0相对不敏感,但它们强烈地依赖于L_0,并且指向比以前报道的更低的L_0值,峰值似然在L_0 ~ 20 MeV附近。最后,我们利用L_0上的后验子导出了高阶核项的新的解析约束。

英文摘要:

The nuclear symmetry energy plays a role in determining both the nuclear properties of terrestrial matter as well as the astrophysical properties of neutron stars. The first measurement of the neutron star tidal deformability, from gravitational wave event GW170817, provides a new way of probing the symmetry energy. In this work, we report on new constraints on the symmetry energy from GW170817. We focus in particular on the low-order coefficients: namely, the value of the symmetry energy at the nuclear saturation density, S_0, and the slope of the symmetry energy, L_0. We find that the gravitational wave data are relatively insensitive to S_0, but that they depend strongly on L_0 and point to lower values of L_0 than have previously been reported, with a peak likelihood near L_0 ~ 20 MeV. Finally, we use the inferred posteriors on L_0 to derive new analytic constraints on higher-order nuclear terms.

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