Quark-hadron crossover equations of state for neutron stars: Constraining the chiral invariant mass in a parity doublet model

Quark-hadron crossover equations of state for neutron stars: Constraining the chiral invariant mass in a parity doublet model
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中子星的夸克-强子交叉状态方程:在宇称双态模型中约束手性不变质量

DOI:
10.1103/physrevc.103.045205
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发表时间:
2020-11
期刊:
影响因子:
3.1
通讯作者:
Masayasu Harada
Masayasu Harada
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Takuya Minamikawa;Toru Kojo;Masayasu Harada

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通过插值低密度强子状态方程和高密度夸克状态方程,构造了中子星的状态方程。对强子物质采用基于宇称二重态结构的强子模型,对夸克物质采用Nambu-Jona-Lasinio型夸克模型。我们假设强子物质和夸克物质在色味锁定相中发生交叉。宇称偶重态模型的核子质量具有与手征对称性破缺相关的质量和对手征凝聚体不敏感的手征不变质量m0。在低密度下,m0的值影响核EOS,并与中子星的半径有很强的相关性。利用LIGO-Virgo和NICER对半径的限制,我们发现m0被限制为600 MeVm ~ 0 900 MeV。
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 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 m0 which is insensitive to the chiral condensate. The value of m0 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 m0 is restrictedas600MeVm0 900MeV.
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