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arXiv 1802.07441nucl-thastro-ph.HEastro-ph.SR
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夸克平均场模型中中子星的核子半径效应

Nucleon radius effects on neutron stars in quark mean field model

Zhen-Yu Zhu, Ang Li

摘要:

在夸克平均场模型的框架下,研究了自由空间核子半径对核物质和中子星的影响。核子半径的处理自洽与这个模型,其中夸克禁闭调整,以适应不同的核子半径值。修正由于质心运动,夸克-π介子耦合,和一个胶子交换包括在真空中获得核子质量。通过再现核物质的经验饱和性质,包括最近对对称性能量参数的测定,重新构造了描述多体核子系统行为的介子耦合常数.结果表明,自由空间中核子半径对核物质物态方程和中子星质量-半径关系的影响可以忽略,这与前人的研究结论不同.我们进一步探讨了早期文献中发现的恒星半径对核子半径的敏感性实际上来自于对称能及其斜率。

英文摘要:

We study the effects of free space nucleon radius on nuclear matter and neutron stars within the framework of quark mean field model. The nucleon radius is treated self-consistently with this model, where quark confinement is adjusted to fit different values of nucleon radius. Corrections due to center-of-mass motion, quark-pion coupling, and one gluon exchange are included to obtain the nucleon mass in vacuum. The meson coupling constants that describe the behavior of many-body nucleonic system are newly-constructed by reproducing the empirical saturation properties of nuclear matter, including the recent determinations of symmetry energy parameters. Our results show that the nucleon radius in free space have negligible effects on nuclear matter equation of state and neutron star mass-radius relations, which is different from the conclusion drawn in previous studies. We further explore that the sensitivity of star radius on the nucleon radius found in earlier publications is actually from the symmetry energy and its slope.

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