多粒子系统中的两粒子问题：I.动态屏蔽阶梯近似
The two-particle problem in a many-particle system: I. Dynamically screened ladder approximation
摘要：
在实时格林函数的框架下研究了非平衡多粒子系统中的两粒子问题。从非平衡Bethe-Salpeter方程的动态屏蔽阶梯近似出发，给出了二次两粒子格林函数的非平衡Dyson方程。从而将著名的Kadanoff-Baym方程推广到两粒子函数的情形。方程的两时间结构是以精确的方式实现的，避免了所谓的Shindo近似。对于热力学平衡的情形，讨论了与以往关于有效二粒子哈密顿量的结果的差别。
英文摘要：
The two-particle problem within a nonequilibrium many-particle system is investigated in the framework of real-time Green's functions. Starting from the dynamically screened ladder approximation of the nonequlibrium Bethe-Salpeter equation, a nonequilibrium Dyson equation is given for two-time two-particle Green's functions. Thereby the well-known Kadanoff-Baym equations are generalized to the case of two-particle functions. The two-time structure of the equations is achieved in an exact way avoiding the so-called Shindo approximation. For the case of thermodynamic equilibrium, the differences to former results obtained for the effective two-particle hamiltonian are discussed.
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