In this paper we study the diagonal cosets of the non-compact H-4 WZW model. Generalising earlier work by Antoniadis and Obers, we provide an exact world-sheet description for several families of non-maximally symmetric gravitational plane waves with background NS fluxes. We show that the sigma-models that correspond to an asymmetric action of the gauge group smoothly interpolate between singular and non-singular plane waves. We also analyse the representations of the coset chiral algebra and derive the spectrum of all the models.

The diagonal cosets of the Heisenberg group

D'APPOLLONIO, GIUSEPPE;
2008

Abstract

In this paper we study the diagonal cosets of the non-compact H-4 WZW model. Generalising earlier work by Antoniadis and Obers, we provide an exact world-sheet description for several families of non-maximally symmetric gravitational plane waves with background NS fluxes. We show that the sigma-models that correspond to an asymmetric action of the gauge group smoothly interpolate between singular and non-singular plane waves. We also analyse the representations of the coset chiral algebra and derive the spectrum of all the models.
Conformal field models in string theory; Conformal and W symmetry; Curved spacetimes
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/15882
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