Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1998-03-09
Physics
High Energy Physics
High Energy Physics - Theory
9 pages, 4 figures, RevTeX
Scientific paper
We study the time development of correlation functions at both zero and finite temperature with Shibata-Hashitsume's projection operator method and carry out the renormalization of ultraviolet divergence that appears in a time-dependent frequency shift, using a mass counter term. A harmless divergence of log t-type remains at an initial time t=0 after the lowest order renormalization.
Koide Takashi
Maruyama Masako
Takagi Fumiko
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