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首页> 外文期刊>Physical review, C >Constant-sound-speed parametrization for Nambu-Jona-Lasinio models of quark matter in hybrid stars
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Constant-sound-speed parametrization for Nambu-Jona-Lasinio models of quark matter in hybrid stars

机译：恒曼-JONA-Lasinio在混合星星夸克型号的恒流速度参数化

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摘要

The discovery of pulsars as heavy as 2 solar masses has led astrophysicists to rethink the core compositions of neutron stars, ruling out many models for the nuclear equations of state (EoS). We explore the hybrid stars that occur when hadronic matter is treated in a relativistic mean-field approximation and quark matter is modeled by three-flavor local and nonlocal Nambu-Jona-Lasinio (NJL) models with repulsive vector interactions. The NJL models typically yield equations of state that feature a first-order transition to quark matter. Assuming that the quark-hadron surface tension is high enough to disfavor mixed phases and restricting to EoSs that allow stars to reach 2 solar masses, we find that the appearance of the quark-matter core either destabilizes the star immediately (this is typical for nonlocal NJL models) or leads to a very short hybrid star branch in the mass-radius relation (this is typical for local NJL models). Using the constant-sound-speed parametrization we can see that the reason for the near absence of hybrid stars is that the transition pressure is fairly high and the transition is strongly first order.
机译：作为2个太阳能群众的脉冲星发现脉冲节的发现是担心天体物理学家来重新思考中子恒星的核心组合物，统治出核方程（EOS）的许多模型。我们探讨了在相对论的平均场景近似下屈光度处理的混合恒星，并且夸克物质由具有排斥载体相互作用的三种风味的局部和非本地Nambu-jona-lasinio（NJL）模型。 NJL模型通常会产生具有到夸克物质的一阶转换的状态的方程。假设夸克强子表面张力足够高，以不喜欢混合阶段并限制欧洲允许恒星达到2个太阳能群众的eoss，我们发现夸克核心的外观要么立即稳定恒星（这是非函数的典型值NJL模型）或导致质量半径关系中非常短的混合星星分支（这是本地NJL型号的典型值）。使用恒定声速参数化，我们可以看到近乎没有混合星星的原因是过渡压力相当高，过渡是强烈的第一顺序。

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  • 来源
    《Physical review, C》 |2016年第4期|共12页
  • 作者

    Ranea-Sandoval Ignacio F.; Han Sophia; Orsaria Milva G.; Contrera Gustavo A.; Weber Fridolin; Alford Mark G.;

  • 作者单位

    Univ Nacl La Plata Fac Ciencias Astron &

    Geofis Grp Gravitac Astrofis &

    Cosmol Paseo Bosque S-N RA-1900 La Plata Buenos Aires Argentina;

    Univ Tennessee Dept Phys &

    Astron Knoxville TN 37996 USA;

    Univ Nacl La Plata Fac Ciencias Astron &

    Geofis Grp Gravitac Astrofis &

    Cosmol Paseo Bosque S-N RA-1900 La Plata Buenos Aires Argentina;

    Univ Nacl La Plata Fac Ciencias Astron &

    Geofis Grp Gravitac Astrofis &

    Cosmol Paseo Bosque S-N RA-1900 La Plata Buenos Aires Argentina;

    San Diego State Univ Dept Phys 5500 Campanile Dr San Diego CA 92182 USA;

    Washington Univ Dept Phys St Louis MO 63130 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
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