Coherent functional expansions in quantum field theory

被引：1

作者：

Drummond, P. D. ^{[1
,2
]}

机构：

[1] Swinburne Univ Technol, Ctr Quantum & Opt Sci, Melbourne, Vic 3122, Australia

[2] Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA

来源：

JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL | 2017年 / 50卷 / 45期

基金：

美国国家科学基金会; 澳大利亚研究理事会;

关键词：

field theory; coherence; perturbation theory; PERTURBATION-THEORY; PHYSICS; GASES; TEMPERATURE; DIVERGENCE; SERIES; STATES;

D O I：

10.1088/1751-8121/aa8d8c

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A new formalism is introduced to treat problems in quantum field theory, using coherent functional expansions rather than path integrals. The basic results and identities of this approach are developed. In the case of a Bose gas with point-contact interactions, this leads to a soluble functional equation in the weak interaction limit, where the perturbing term is part of the kinetic energy. This approach has the potential to prevent the Dyson problem of divergence in perturbation theory.

引用

页数：9

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