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Asymmetrically gauged WZNW models
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DOI：10.1002/prop.200310106.png)
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Many interesting exactly solvable backgrounds can be obtained by gauging WZNW models asymmetrically. These include the base of the conifold and the time dependent Nappi-Witten background in which a 3-dimensional universe passes through a series of big-bang big-crunch singularities. In this short note we review recent results on the conformal field theory description of asymmetric cosets. In particular, we present formulas for their bulk modular invariant partition functions and for a large number of D-brane boundary states.
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SIGMA-MODELS
HOMOGENEOUS SPACES
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