光阵面耦合团簇法中的零模
Zero modes in the light-front coupled-cluster method
摘要：
光阵面耦合团簇（LFCC）方法是光阵面量子化场论中求解哈密顿本征值问题的一种方法。它的主要目的是提供一个系统的序列可解近似的原始特征值问题没有截断的Fock空间。在这里，我们讨论的零模式，零纵向动量的模式，纳入形式主义的方法。没有零模，光场的真空是微不足道的，并且光场的真空期望值总是零。具有零模式的LFCC方法以零模式的广义相干态的形式提供真空结构，如这里在二维模型场论中所示。
英文摘要：
The light-front coupled-cluster (LFCC) method is a technique for solving Hamiltonian eigenvalue problems in light-front-quantized field theories. Its primary purpose is to provide a systematic sequence of solvable approximations to the original eigenvalue problem without the truncation of Fock space. Here we discuss the incorporation of zero modes, modes of zero longitudinal momentum, into the formalism of the method. Without zero modes, the light-front vacuum is trivial, and the vacuum expectation value of the field is always zero. The LFCC method with zero modes provides for vacuum structure, in the form of a generalized coherent state of zero modes, as is illustrated here in two-dimensional model field theories.
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