标题： 临界终点处NJL模型中的标量密度涨落 显示英文标题

标题： Scalar density fluctuation at critical end point in NJL model

摘要： 在两味Nambu--Jona-Lasinio（NJL）模型相图的临界终点附近的软模式被研究，这是在领先的1/N_c近似下进行的，其中N_c是颜色的数量。通过研究标量通道的谱函数，明确显示相关的软模式是标量密度涨落，它与夸克数密度耦合，而sigma介子模式保持为质量态。 显示英文摘要

摘要： Soft mode near the critical end point in the phase diagram of two-flavor Nambu--Jona-Lasinio (NJL) model is investigated within the leading 1/N_c approximation with N_c being the number of the colors. It is explicitly shown by studying the spectral function of the scalar channel that the relevant soft mode is the scalar density fluctuation, which is coupled with the quark number density, while the sigma meson mode stays massive.