Titlebook: Strings and Symmetries; Proceedings of the G Gülen Aktaş,Cihan Saçlioğlu,Meral Serdaroğlu Conference proceedings 1995 Springer-Verlag Berli

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0075-8450 heories, .W. and Virasoro algebras, topological field theory, quantum groups, vertex and Hopf algebras, and non-commutative geometry. The relatively long contributions are pedagogical in style and address students as well as scientists.978-3-662-14032-1978-3-540-49204-7Series ISSN 0075-8450 Series E-ISSN 1616-6361

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箴言

Extended superconformal symmetry, Freudenthal triple systems and gauged WZW models,1) symmetry. A detailed study of the construction and classification of . = 2 and . = 4 SCA‘s over Freudenthal triple systems is given. We conclude with a study and classification of gauged WZW models with . = 4 superconformal symmetry.

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Search for duality symmetries in p-branes,bgroup of the seeked SL(2). These transformations also leave invariant the first class constraints generating the worldvolume reparametrizations. In the special case of p-branes in p+1 dimensions, the full SL(2) is realized

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Finite deformations of CF T and space-time geometry,ir calculation. The symmetries corresponding to equivalence relations of CFT are described. In this framework we show how to perform nonperturbative analysis in the low-energy limit and prove that it corresponds to Brans-Dicke theory of gravity interacting with a skewsymmetric tensor field.

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