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arXiv 1901.07673nucl-exnucl-th
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对中子星内对称能的进一步理解

Towards a better understanding of the symmetry energy within neutron stars

C. Y. Tsang, M. B. Tsang, P. Danielewicz, W. G. Lynch, F. J. Fattoyev

摘要:

LIGO-Virgo合作突破性地探测了双星合并事件GW 170817,扩大了理解核物质状态方程(EoS)的努力。这些测量提供了对整体压力的新限制,但本身并不能阐明其微观起源,包括由对称能产生的压力,这决定了中子星的大部分内部结构。为了将来自核测量的微观约束与GW 170817约束相关联,我们用200多个描述原子核性质的Skyrme能量密度泛函计算了中子星性质。计算出的中子星半径(R)和潮汐形变率在两倍饱和密度下与压力有很强的相关性。结合从GW 170817事件中提取的中子星EoS和从核-核碰撞实验中提取的对称物质EoS,我们提取了对称压力在1.2 ~ 4.5倍饱和密度范围内的密度依赖关系。虽然对称压力的不确定性很大,但可以通过新的实验和天体物理结果来减少。

英文摘要:

The LIGO-Virgo collaboration ground-breaking detection of the binary neutron-star merger event, GW170817, has expanded efforts to understand the Equation of State (EoS) of nuclear matter. These measurements provide new constraints on the overall pressure, but do not, by itself, elucidate its microscopic origins, including the pressure arising from the symmetry energy, that governs much of the internal structure of a neutron star. To correlate microscopic constraints from nuclear measurements to the GW170817 constraints, we calculate neutron star properties with more than 200 Skyrme energy density functionals that describe properties of nuclei. Calculated neutron-star radii (R) and the tidal deformabilities which show a strong correlation with pressure at twice saturation density. By combining the neutron star EoS extracted from the GW170817 event and the EoS of symmetric matter from nucleus-nucleus collision experiments, we extract the density dependence of the symmetry pressure from 1.2 to 4.5 times saturation density. While the uncertainties in the symmetry pressure are large, they can be reduced with new experimental and astrophysical results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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