Duality Beyond the First Loop

Details Duality Beyond the First Loop Duality Beyond the First Loop

1997-05-25

arxiv.org/abs/hep-th/9705193v2

Phys.Rev. D56 (1997) 7940-7953

Physics

High Energy Physics

High Energy Physics - Theory

26 pages, latex, no figures. Several typos corrected, and references to Nucl. Phys. B405 (1993) 109 by E. Kiritsis and Nucl. P

Scientific paper

10.1103/PhysRevD.56.7940

In this article we give a calculation of the two-loop $\sigma$-model corrections to the T-duality map in string theory. We use the effective action approach, and analyze two-loop corrections in a specific subtraction scheme. Focusing on backgrounds which have a single Abelian isometry, we find the explicit form for the $O(\alpha')$ modifications of the lowest order duality transformations. Rather surprisingly, the manifest two-loop duality depends crucially on the torsion field. In contrast to the dilaton and metric fields, which are merely passive spectators, the torsion plays a more active role, because of the anomalous couplings to the gauge fields that arise via dimensional reduction. Our results support the interpretation of T-duality as an expansion in the inverse string tension $\alpha'$, and its order-by-order realization as a manifest symmetry of the full string theory.

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