Causal signal transmission by quantum fields. II: Quantum-statistical response of interacting bosons
2008 (English)In: Annals of Physics, ISSN 0003-4916, E-ISSN 1096-035X, Vol. 323, no 8, 1989-2017 p.Article in journal (Refereed) Published
We analyse nonperturbatively signal transmission patterns in Green's functions of interacting quantum fields. Quantum field theory is reformulated in terms of the nonlinear quantum-statistical response of the field. This formulation applies equally to interacting relativistic fields and nonrelativistic models. Of crucial importance is that all causality properties to be expected of a response formulation indeed hold. Being by construction equivalent to Schwinger's closed-time-loop formalism, this formulation is also shown to be related naturally to both Kubo's linear response and Glauber's macroscopic photodetection theories, being a unification of the two with generalisation to the nonlinear quantum-statistical response problem. In this paper we introduce response formulation of bosons; response reformulation of fermions will be subject of a separate paper.
Place, publisher, year, edition, pages
2008. Vol. 323, no 8, 1989-2017 p.
quantum-statistical response problem, quantum field theory, phase-space methods
IdentifiersURN: urn:nbn:se:kth:diva-36434DOI: 10.1016/j.aop.2007.11.014ISI: 000257132700008OAI: oai:DiVA.org:kth-36434DiVA: diva2:430811
QC 201107122011-07-122011-07-122011-07-12Bibliographically approved