T-Duality without Quantum Corrections
arXiv:hep-th/9701178 · doi:10.1016/S0370-2693(97)00332-8
Abstract
It is a well known fact that the classical (``Buscher'') transformations of T-duality do receive, in general, quantum corrections. It is interesting to check whether classical T-duality can be exact as a quantum symmetry. The natural starting point is a -model with N=4 world sheet supersymmetry. Remarkably, we find that (owing to the fact that N=4 models with torsion are not off-shell finite as quantum theories),the T-duality transformations for these models get in general quantum corrections, with the only known exception of warped products of flat submanifolds or orbifolds thereof with other geometries.
7 pages, LaTeX. Final version, to appear in Phys. Lett.B. (some typos corrected)
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