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中子星内部强子-夸克相变的有限尺度效应研究

武旭浩 申虹

武旭浩, 申虹. 中子星内部强子-夸克相变的有限尺度效应研究[J]. 原子核物理评论, 2017, 34(3): 509-513. doi: 10.11804/NuclPhysRev.34.03.509
引用本文: 武旭浩, 申虹. 中子星内部强子-夸克相变的有限尺度效应研究[J]. 原子核物理评论, 2017, 34(3): 509-513. doi: 10.11804/NuclPhysRev.34.03.509
WU Xuhao, SHEN Hong. Hadron-quark Phase Transition with Finite-size Effect in Neutron Stars[J]. Nuclear Physics Review, 2017, 34(3): 509-513. doi: 10.11804/NuclPhysRev.34.03.509
Citation: WU Xuhao, SHEN Hong. Hadron-quark Phase Transition with Finite-size Effect in Neutron Stars[J]. Nuclear Physics Review, 2017, 34(3): 509-513. doi: 10.11804/NuclPhysRev.34.03.509

中子星内部强子-夸克相变的有限尺度效应研究

doi: 10.11804/NuclPhysRev.34.03.509
基金项目: 国家自然科学基金资助项目(11375089,11675083)
详细信息
    作者简介:

    武旭浩(1992-),男,河北宁晋人,博士研究生,从事理论物理研究;E-mail:yuechengflyingbird@mail.nankai.edu.cn

    通讯作者: 申虹,E-mail:shennankai@gmail.com
  • 中图分类号: O571.5

Hadron-quark Phase Transition with Finite-size Effect in Neutron Stars

Funds: National Natural Science Foundation of China(11375089, 11675083)
More Information
    Corresponding author: 10.11804/NuclPhysRev.34.03.509
  • 摘要: 在致密星体内部极高密度条件下,强子物质可能发生退禁闭相变成为夸克物质,即强子-夸克相变。这种相变过程对于中子星的性质有着重要影响。考虑库仑能和表面能的影响,即有限尺度效应,相变过程中的混杂相包含了被称为pasta相的几何结构。强子-夸克共存相的平衡条件是通过求总能量的最小值得到的。采用相对论平均场(RMF)模型来描述强子物质相,采用Nambu-Jona-Lasinio(NJL)模型来描述夸克物质相。有限尺度效应一定程度上增加了中子星的最大质量,增加幅度取决于强子-夸克表面张力的大小。有限尺度效应能够降低混杂相的范围,其结果介于Gibbs结构和Maxwell结构的结果之间。研究结果表明,中子星中可能包含一个混杂相的核心部分,其大小受到表面张力等参数的影响。


    It is generally considered that hadron matter may undergo a deconfinement phase transition becoming quark matter at very high density in massive neutron stars. This hadron-quark phase transition has important impact on neutron stars, which has received much attention. We consider finite-size effect in this phase transition process, which contains the impact of Coulomb energy and surface energy. By including this effect, the mixed phase forms the pasta structures. The equilibrium conditions for coexisting hadronic and quark phases are derived by minimizing the total energy including the surface and Coulomb contributions. We employ the relativistic mean-field(RMF) model to describe the hadronic phase, while the Nambu-Jona-Lasinio(NJL) model is used for the quark phase. We conclude that the finite-size effect will raise the stiffness of EOS, and then increase the maximum mass of neutron stars, which depend on the value of surface tension. Our results show that finite-size effects can significantly reduce the region of the mixed phase, and the results lie between those from the Gibbs and Maxwell constructions. We show that a massive star may contain a mixed phase core and its size depends on the surface tension of the hadron-quark interface.
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出版历程
  • 收稿日期:  2016-11-20
  • 修回日期:  2017-04-15
  • 刊出日期:  2017-07-18

中子星内部强子-夸克相变的有限尺度效应研究

doi: 10.11804/NuclPhysRev.34.03.509
    基金项目:  国家自然科学基金资助项目(11375089,11675083)
    作者简介:

    武旭浩(1992-),男,河北宁晋人,博士研究生,从事理论物理研究;E-mail:yuechengflyingbird@mail.nankai.edu.cn

    通讯作者: 申虹,E-mail:shennankai@gmail.com
  • 中图分类号: O571.5

摘要: 在致密星体内部极高密度条件下,强子物质可能发生退禁闭相变成为夸克物质,即强子-夸克相变。这种相变过程对于中子星的性质有着重要影响。考虑库仑能和表面能的影响,即有限尺度效应,相变过程中的混杂相包含了被称为pasta相的几何结构。强子-夸克共存相的平衡条件是通过求总能量的最小值得到的。采用相对论平均场(RMF)模型来描述强子物质相,采用Nambu-Jona-Lasinio(NJL)模型来描述夸克物质相。有限尺度效应一定程度上增加了中子星的最大质量,增加幅度取决于强子-夸克表面张力的大小。有限尺度效应能够降低混杂相的范围,其结果介于Gibbs结构和Maxwell结构的结果之间。研究结果表明,中子星中可能包含一个混杂相的核心部分,其大小受到表面张力等参数的影响。


It is generally considered that hadron matter may undergo a deconfinement phase transition becoming quark matter at very high density in massive neutron stars. This hadron-quark phase transition has important impact on neutron stars, which has received much attention. We consider finite-size effect in this phase transition process, which contains the impact of Coulomb energy and surface energy. By including this effect, the mixed phase forms the pasta structures. The equilibrium conditions for coexisting hadronic and quark phases are derived by minimizing the total energy including the surface and Coulomb contributions. We employ the relativistic mean-field(RMF) model to describe the hadronic phase, while the Nambu-Jona-Lasinio(NJL) model is used for the quark phase. We conclude that the finite-size effect will raise the stiffness of EOS, and then increase the maximum mass of neutron stars, which depend on the value of surface tension. Our results show that finite-size effects can significantly reduce the region of the mixed phase, and the results lie between those from the Gibbs and Maxwell constructions. We show that a massive star may contain a mixed phase core and its size depends on the surface tension of the hadron-quark interface.

English Abstract

武旭浩, 申虹. 中子星内部强子-夸克相变的有限尺度效应研究[J]. 原子核物理评论, 2017, 34(3): 509-513. doi: 10.11804/NuclPhysRev.34.03.509
引用本文: 武旭浩, 申虹. 中子星内部强子-夸克相变的有限尺度效应研究[J]. 原子核物理评论, 2017, 34(3): 509-513. doi: 10.11804/NuclPhysRev.34.03.509
WU Xuhao, SHEN Hong. Hadron-quark Phase Transition with Finite-size Effect in Neutron Stars[J]. Nuclear Physics Review, 2017, 34(3): 509-513. doi: 10.11804/NuclPhysRev.34.03.509
Citation: WU Xuhao, SHEN Hong. Hadron-quark Phase Transition with Finite-size Effect in Neutron Stars[J]. Nuclear Physics Review, 2017, 34(3): 509-513. doi: 10.11804/NuclPhysRev.34.03.509
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