کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1855248 | 1529936 | 2017 | 29 صفحه PDF | دانلود رایگان |
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.
Journal: Annals of Physics - Volume 323, Issue 8, August 2008, Pages 1989–2017