학술논문
Functional perturbative approach to equal-time correlation functions.
Document Type
Article
Author
Source
Subject
*FUNCTIONAL analysis
*PERTURBATION theory
*STATISTICAL correlation
*ANALYSIS of covariance
*INFRARED radiation
*QUANTUM chromodynamics
*COULOMB functions
*GAUGE field theory
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Language
ISSN
0217-751X
Abstract
Equal-time correlation functions play a central role in the recent noncovariant approaches to infrared QCD in the Coulomb gauge. In this article, we explore the possibilities to derive equal-time correlation functions from a generating functional, represent them diagrammatically, and formulate nonperturbative relations similar to Dyson-Schwinger equations among them, in analogy to the covariant n-point functions. For simplicity, we set up the formalism for λϕ4 theory and derive explicit expressions for the equal-time 2- and 4-point functions. [ABSTRACT FROM AUTHOR]