منابع مشابه
Gauged WZW Models
As shown by Witten the N = 1 supersymmetric gauged WZW model based on a group G has an extended N = 2 supersymmetry if the gauged subgroup H is so chosen that G/H is Kähler. We extend Witten’s result and prove that the N = 1 supersymmetric gauged WZW models over G×U(1) are actually invariant under N = 4 superconformal transformations if the gauged subgroup H is such that G/(H × SU(2)) is a quat...
متن کاملTopological Strings from WZW Models
We show that the BRST structure of the topological string is encoded in the “small” N = 4 superconformal algebra, enabling us to obtain, in a non-trivial way, the string theory from hamiltonian reduction of A(1|1). This leads to the important conclusion that not only ordinary string theories, but topological strings as well, can be obtained, or even defined, by hamiltonian reduction from WZW mo...
متن کاملWzw-models in Extended Superspace
We find the complex structure on the dual of a complex target space. For N = (2, 2) systems, we prove that the space orthogonal to the kernel of the commutator of the left and right complex structures is always integrable, and hence the kernel is parametrized by chiral and twisted chiral superfield coordinates. We then analyze the particular case of SU(2) × SU(2), and are led to a new N = 2 sup...
متن کاملLogarithmic Yangians in WZW models
A new action of the Yangians in the WZW models is displayed. Its structure is generic and level independent. This Yangian is the natural extension at the conformal point of the one unravelled in massive theories with current algebras. Expectingly, this new symmetry of WZWmodels will lead to a deeper understanding of the integrable structure of conformal field theories and their deformations. 12...
متن کاملAspects of Wzw Models at Critical Level *
We consider non-compact WZW models at critical level (equal to the dual Coxeter number) as tensionless limits of gravitational backgrounds in string theory. Special emphasis is placed on the Euclidean black hole coset SL(2, R)k/U(1) when k = 2. In this limit gravity decouples in the form of a Liouville field with infinite background charge and the world-sheet symmetry of the model becomes a tru...
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ژورنال
عنوان ژورنال: Classical and Quantum Gravity
سال: 2004
ISSN: 0264-9381,1361-6382
DOI: 10.1088/0264-9381/21/10/024