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Duality Symmetries from Non--Abelian Isometries in String Theories
Xenia C. de la Ossa, Fernando Quevedo
In string theory it is known that abelian isometries in the sigma model lead to target space duality. We generalize this duality to backgrounds with non--abelian isometries. The pr…
Noncompact Coset Spaces in String Theory
Fernando Quevedo
A brief overview of strings propagating on noncompact coset spaces G/H is presented in terms of WZW models. The role played by isometries in the existence of target space duality a…
Supersymmetry Protects the Primordial Baryon Asymmetry
Luis E. Ibanez, Fernando Quevedo
It has been argued that any primordial B+L asymmetry existing at very high temperatures can be subsequently erased by anomalous electroweak effects. We argue that this is not neces…
Strings on Curved Spacetimes: Black Holes, Torsion, and Duality
Paul Ginsparg, Fernando Quevedo
We present a general discussion of strings propagating on noncompact coset spaces in terms of gauged WZW models, emphasizing the role played by isometries in the existence of…