THERMO FIELD-DYNAMICS (REPRINTED FROM COLLECTIVE-PHENOMENA, VOL 2, PG55-80, 1975)

Authors
TAKAHASHI Y UMEZAWA H
Citation
Y. Takahashi et H. Umezawa, THERMO FIELD-DYNAMICS (REPRINTED FROM COLLECTIVE-PHENOMENA, VOL 2, PG55-80, 1975), International journal of modern physics b, 10(13-14), 1996, pp. 1755-1805
Citations number
14
Categorie Soggetti
Physics, Condensed Matter","Physycs, Mathematical","Physics, Applied
Journal title
International journal of modern physics b → ACNP
ISSN journal
02179792
Volume
10
Issue
13-14
Year of publication
1996
Pages
1755 - 1805
Database
ISI
SICI code
0217-9792(1996)10:13-14<1755:TF(FCV>2.0.ZU;2-O
Abstract
A quantum field theory at finite temperature is presented. The tempera ture dependent vacuum is defined such that the vacuum expectation valu e agrees with the statistical average. The vacuum states with differen t temperature are connected by a Bogoliubov transformation. Our formal ism allows the use of the Feynman diagrams for the causal Green's func tion and the Bethe-Salpeter technique for bound states at finite tempe rature. The entropy operator is introduced.