Takuya Minamikawa, T. Kojo, M. Harada
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引用次数: 11

摘要

本文通过插值低密度强子态方程和高密度夸克态方程,构造了中子星的态方程。强子物质采用基于宇称重态结构的强子模型,夸克物质采用Nambu—Jona-Lasinio型夸克模型。我们假设强子物质和夸克物质在色香味锁相中发生交叉。宇称重态模型的核子质量有一个与手性对称性破缺有关的质量,以及一个对手性凝聚不敏感的手性不变质量m_0。$m_0$的值影响低密度时的核eos,并且与中子星半径有很强的相关性。利用LIGO-Virgo和NICER得到的半径约束,我们发现$m_0$被限制为$700\,\mathrm{MeV}\lesssim m_0 \lesssim 900\,\mathrm{MeV}$。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Quark-hadron crossover equations of state for neutron stars: Constraining the chiral invariant mass in a parity doublet model
We construct an equation of state (EOS) for neutron stars by interpolating hadronic EOS at low density and quark EOS at high density. A hadronic model based on the parity doublet structure is used for hadronic matter and a quark model of Nambu--Jona-Lasinio type is for quark matter. We assume crossover between hadronic matter and quark matter in the the color-flavor locked phase. The nucleon mass of the parity doublet model has a mass associated with the chiral symmetry breaking, and a chiral invariant mass $m_0$ which is insensitive to the chiral condensate. The value of $m_0$ affects the nuclear EOSs at low density, and has strong correlations with the radii of neutron stars. Using the constraint to the radius obtained by LIGO-Virgo and NICER, we find that $m_0$ is restricted as $700\,\mathrm{MeV}\lesssim m_0 \lesssim 900\,\mathrm{MeV}$.
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