The Extension Structure of 2D Massive Current Algebras
نویسنده
چکیده
The extension structure of the 2-dimensional current algebra of non-linear sigma models is analysed by introducing Kostant Sternberg (L, M) systems. It is found that the algebra obeys a two step extension by abelian ideals. The second step is a non-split extension of a representation of the quotient of the algebra by the first step of the extension. The cocycle which appears is analysed. Harvard University HUTMP–92/B323 University of Freiburg THEP 91/21 December 1991 Permanent address : Universität Freiburg, Fakultät für Physik, Hermann-Herder Strasse 3, D-7800 Freiburg i.Br. / Germany
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