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Can the S-matrix be generated from its lowest-order term?

By N.G. van Kampen

Abstract

The suggestion that the S-matrix can be generated from its lowest-order term by successive applications of the unitarity and causality conditions, is tested on a simple example. It is shown that the procedure is vitiated by the breakdown of the expansion near resonance, which makes an application of the Kramers-Kronig relations to the separate terms impossible. In the case of propagation of waves through a medium the state of affairs is analogous

Topics: Natuur- en Sterrenkunde
Year: 1957
OAI identifier: oai:dspace.library.uu.nl:1874/15618
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