Title: Improved Schwinger-Dyson approach to pairing phenomena and QCD phase diagram Show Chinese title

Title: 改进的施温格-戴森方法在配对现象和QCD相图中的应用

Abstract: Phase structure and phase transitions in dense QCD are studied using the Cornwall-Jackiw-Tomboulis (CJT) potential in the improved ladder approximation. The gap function, the condensation energy and the structure of Cooper pairs are investigated at finite temperature and density. Due to strong coupling effects at low densities, the gap, critical temperature and their ratio deviate from the weak coupling values. It is shown that the internal structure of Cooper pairs are robust against the thermal effects, despite the fact that the pairs are strongly correlated near the critical temperature. Also, the effect of the strange quark mass, Ms on the phase diagram is examined using a simple kinematical criterion. We discuss the behavior of the unlocking line, on which the CFL turns into the 2SC, through the variation of Ms. Show Chinese abstract

Abstract: 密集QCD中的相结构和相变使用改进的梯形近似中的Cornwall-Jackiw-Tomboulis(CJT)势进行研究。在有限温度和密度下研究了间隙函数、凝聚能和库珀对的结构。由于低密度下的强耦合效应，间隙、临界温度及其比值偏离弱耦合值。尽管在临界温度附近对是强关联的，但显示库珀对的内部结构对热效应具有鲁棒性。此外，使用简单的运动学准则检查了奇异夸克质量Ms对相图的影响。我们讨论了解锁线上的行为，在该线上CFL转变为2SC，通过Ms的变化来实现。