Repulsive vector interaction as a trigger for the non-conformal peak in $V_s^2$
Repulsive vector interaction as a trigger for the non-conformal peak in $V_s^2$
复制标题
排斥矢量相互作用作为 $V_s^2$ 中非共形峰的触发因素
DOI：
--
复制
发表时间：
2022
期刊：
影响因子：
--
通讯作者：
M. B. Pinto
中科院分区：
文献类型：
--
作者：
M. B. Pinto
考虑到以gv为参数的具有排斥力矢量通道的NJL模型，我表明人们可以产生声速的非单调行为，其峰值为v2> 1 / 3。这可以通过假设gv与密度相关来实现，这样得到的EoS在低密度时是硬的/排斥的，在高密度时是软的/非排斥的。两种结构之间的内插是通过一阶手性跃迁发生后的交叉来实现的。该模型明确表明，v2s中的非共形峰在所有密度下都不处于张力状态，QCD迹线异常在所有密度下都是正的，这支持了最近在这个方向上的说法。在简单非奇异夸克星的背景下，简要讨论了运行耦合对质量-半径关系的影响。
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 2 s > 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 2 s 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.