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基于ＢＢＧＫＹ方程，采用二阶扰动理论探索了可观物理量与扰动波矢的相互关系。结果发现，两个扰动带电粒子之间存在一个关联它们的非线性力。这个被称之为结合力的空间尺度是由扰动波矢的虚部决定的。这个结合力的一般表示包含一个吸引项和一个排斥项，它们随粒子的温度和它们的扰动频率而变化。包含在这个结合力中的最重要的信息是同物质的基本构成和它们之间相互作用的性质相联系的。
Based on BBGKY equation, the second order perturbation theory is used to explore the relationship between observable physical quantities and perturbed wave vectors. The result shows that there exists a nonlinear force between two disturbing charged particles. This space scale, known as the cohesion, is determined by the imaginary part of the disturbance wave vector. The general expression of this binding consists of an attractive term and an exclusive term that vary with the temperature of the particles and their frequency of perturbations. The most important message contained in this cohesion is linked to the basic constitution of matter and the nature of the interaction between them.