Causal signal transmission by quantum fields. IV. The causal Wick theorem
2011 (English)In: Physical Review D, ISSN 1550-7998, Vol. 84, no 6, 065025- p.Article in journal (Refereed) Published
Wick's theorem in the Schwinger-Perel-Keldysh closed-time-loop formalism is written in a form where the place of contractions is taken by the linear response function of the field. This result demonstrates that the physical information supplied by Wick's theorem for operators is propagation of the free field in space and time.
Place, publisher, year, edition, pages
2011. Vol. 84, no 6, 065025- p.
Diagram Technique, Time
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:kth:diva-42369DOI: 10.1103/PhysRevD.84.065025ISI: 000295009800009ScopusID: 2-s2.0-80053924420OAI: oai:DiVA.org:kth-42369DiVA: diva2:446964
QC 201110102011-10-102011-10-102012-11-19Bibliographically approved