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Causal signal transmission by quantum fields. IV. The causal Wick theorem
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Quantum Electronics and Quantum Optics, QEO (moved to SCI 2011-07-01).
2011 (English)In: Physical Review D, ISSN 1550-7998, Vol. 84, no 6, 065025- p.Article in journal (Refereed) Published
Abstract [en]

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.
Keyword [en]
Diagram Technique, Time
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-42369DOI: 10.1103/PhysRevD.84.065025ISI: 000295009800009ScopusID: 2-s2.0-80053924420OAI: diva2:446964

QC 20111010

Available from: 2011-10-10 Created: 2011-10-10 Last updated: 2012-11-19Bibliographically approved

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Stenholm, Stig
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Quantum Electronics and Quantum Optics, QEO (moved to SCI 2011-07-01)
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