T-Duality Can Fail

Details T-Duality Can Fail T-Duality Can Fail

1999-05-05

arxiv.org/abs/hep-th/9905036v1

JHEP 9908:001,1999

Physics

High Energy Physics

High Energy Physics - Theory

18 pages, 3 figures, LaTeX2e

Scientific paper

10.1088/1126-6708/1999/08/001

We show that T-duality can be broken by nonperturbative effects in string coupling. The T-duality in question is that of the 2-torus when the heterotic string is compactified on K3 x T2. This case is compared carefully to a situation where T-duality appears to work. A holonomy argument is presented to show that T-dualities (and general U-dualities) should only be expected for large amounts of supersymmetry. This breaking of R <-> 1/R symmetry raises some interesting questions in string theory which we discuss. Finally we discuss how the classical modular group of a 2-torus appears to be broken too.

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