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论文类型：期刊论文

发表时间：2014-01-21

发表刊物：Phys.Rev. D

学科门类：理学

一级学科：物理学

卷号：89

期号：2

页面范围：025013

摘要：We consider a symmetric scalar theory with quartic coupling in 2- and 3-dimensions and compare the self-consistent 4-point vertex obtained from the 4PI effective action with the Bethe-Salpeter 4-vertex from 2PI effective action. At zero external momenta the two vertices agree well with each other when the coupling strength is small, but differences between them become more and more pronounced as the coupling strength is increased. We also study the momentum dependence of the two vertices and show that for certain momentum configurations they are almost identical, but differ for general momentu

备注：arXiv:1310.4352，论文作者按姓氏排序，*为通讯作者