An important application for hyperbolic Hubbard-Stranonovich transformations is the derivation of hyperbolic sigma models. We will explain the Schaefer-Wegner and Pruisken-Schaefer variants of the transformation. Until recently the mathematical status of the latter was unclear. We will give a proof of the Pruisken-Schaefer variant of the transformation, and clarify the connection to the Schaefer-Wegner variant.
http://www.newton.ac.uk/programmes/MPA/seminars/082111301.html
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