ANALYTIC CONTINUATION OF THERMAL N-POINT FUNCTIONS FROM IMAGINARY TO REAL ENERGIES

被引:25
作者
BAIER, R [1 ]
NIEGAWA, A [1 ]
机构
[1] OSAKA CITY UNIV, DEPT PHYS, SUMIYOSHI KU, OSAKA 558, JAPAN
关键词
D O I
10.1103/PhysRevD.49.4107
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Thermal n-point Green functions in the framework of quantum field theory at finite temperature are considered. We reanalyze how analytic continuations from imaginary to real energies relate these functions originally defined in the imaginary-time formalism to retarded and advanced real-time ones. We described a new and rather simple method which is valid to all orders of perturbation theory and which has the further advantage that it is independent of approximations often applied in actual finite-order calculations.
引用
收藏
页码:4107 / 4112
页数:6
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