论文标题
排斥矢量互动作为$ v_s^2 $中非符号峰的触发器
Repulsive vector interaction as a trigger for the non-conformal peak in $V_s^2$
论文作者
论文摘要
考虑到具有排斥矢量通道的NJL模型，通过$ g_v $进行了参数，我表明一个人可能会为声音速度生成非单调行为，该行为在$ v_s^2> 1/3 $上达到峰值。这可以通过假设$ g_v $是密度依赖性来实现，以使所得的EOS在低密度和高密度下的软/非抑制作用下僵硬/排斥。这两个制度之间的插值是通过在一阶手性转变集后发生的交叉进行的。该模型明确表明，$ v_s^2 $中的非符号峰并不紧张，QCD痕量痕量痕量无常在所有密度上都是正面的，从而在这个方向上支持了最近的主张。关于运行耦合如何影响质量 - 拉迪乌斯关系的简要讨论是在简单的非震撼夸克恒星的背景下进行的。
Considering the NJL model with a repulsive vector channel, parametrized by $G_V$, I show that one may generate a non-monotonic behavior for the speed of sound which peaks at $V_s^2 > 1/3$. This can be achieved by assuming $G_V$ to be density dependent so that the resulting EoS is stiff/repulsive at low densities and soft/non-repulsive at high densities. The interpolation between the two regimes happens through a cross-over which takes place after the first order chiral transition sets in. The model explicitly shows that a non-conformal peak in $V_s^2$ is not in tension with the QCD trace anomaly being positive at all densities, supporting recent claims in this direction. A brief discussion on how the running coupling may affect the mass-radius relation is carried out in the context of simple non-strange quark stars.
