标题： 1/N_c展开的有限温度下的夸克凝聚 显示英文标题

标题： 1/N_c- expansion of the quark condensate at finite temperature

摘要： 以前在有限温度的多夸克系统中，夸克和介子性质已在哈特里近似下的有效QCD方法中进行了研究。 在本文中，我们考虑介子相关性对夸克自能和夸克传播子的影响，这是在系统性的$1/N_c$-展开中进行的。 使用非局部相互作用的一般可分离假设，我们推导出夸克传播子的$1/N_c$修正的自洽方程。 对于具有截断形式因子的可分离模型，我们在零温度下得到了约20%的凝聚量减少。 由于包含了介子相关性，获得了临界温度降低的结论，这似乎更接近于格点计算的结果。 显示英文摘要

摘要： Previously the quark and meson properties in a many quark system at finite temperature have been studied within effective QCD approaches in the Hartree approximation. In the present paper we consider the influence of the mesonic correlations on the quark self-energy and on the quark propagator within a systematic $1/N_c$- expansion. Using a general separable ansatz for the nonlocal interaction, we derive a selfconsistent equation for the $1/N_c$ correction to the quark propagator. For a separable model with cut-off formfactor, we obtain a decrease of the condensate of the order of 20\% at zero temperature. A lowering the critical temperature for the onset of the chiral restoration transition due to the inclusion of mesonic correlations is obtained what seems to be closer to the results from lattice calculations.