Effect of color superconductivity on the mass and radius of a quark star
Effect of color superconductivity on the mass and radius of a quark star
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DOI：
10.1103/physrevd.69.045011
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发表时间：
2003-09
影响因子：
5
通讯作者：
Stefan B. Ruester;D. Rischke
中科院分区：
文献类型：
--
作者：
Stefan B. Ruester;D. Rischke
我们比较了夸克星的颜色超导夸克物质正常的夸克星。我们研究了最简单的色超导体系--双味色超导体，采用Nambu\char21{}Jona-Lasinio（NJL）模型计算了它的差距参数和状态方程.通过改变NJL模型中四费米子耦合的强度，我们研究了夸克星星的质量和半径随差距参数的变化。如果耦合常数超过一个临界值，即使在零密度下，差距参数也不会消失。对于低于这个临界值的耦合常数，色超导夸克星星的质量和半径与正常导电夸克物质组成的星星相比最多变化20%。对于高于临界值的耦合常数，质量和半径可以改变两倍或更多倍。
We compare quark stars made of color-superconducting quark matter to normal-conducting quark stars. We focus on the most simple color-superconducting system, a two-flavor color superconductor, and employ the Nambu\char21{}Jona-Lasinio (NJL) model to compute the gap parameter and the equation of state. By varying the strength of the four-fermion coupling of the NJL model, we study the mass and the radius of the quark star as a function of the value of the gap parameter. If the coupling constant exceeds a critical value, the gap parameter does not vanish even at zero density. For coupling constants below this critical value, mass and radius of a color-superconducting quark star change at most by $\ensuremath{\sim}20%$ compared to a star consisting of normal-conducting quark matter. For coupling constants above the critical value, mass and radius may change by factors of two or more.