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O(d,d) invariance at two and three loops

I. Jack, S. Parsons

hep-tharXiv:hep-th/9911064

Abstract

We show that in a two-dimensional sigma-model whose fields only depend on one target space co-ordinate, the O(d,d) invariance of the conformal invariance conditions observed at one loop is preserved at two loops (in the general case with torsion) and at three loops (in the case without torsion).

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