Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1995-12-06
Phys.Lett. B372 (1996) 65-71
Physics
High Energy Physics
High Energy Physics - Theory
15 pages, LaTeX
Scientific paper
10.1016/0370-2693(96)00025-1
A duality invariant first order action is constructed on the loop group of a Drinfeld double. It gives at the same time the description of both of the pair of $\sigma$-models related by Poisson-Lie T-duality. Remarkably, the action contains a WZW-term on the Drinfeld double not only for conformally invariant $\si$-models. The resulting actions of the models from the dual pair differ just by a total derivative corresponding to an ambiguity in specifying a two-form whose exterior derivative is the WZW three-form. This total derivative is nothing but the Semenov-Tian-Shansky symplectic form on the Drinfeld double and it gives directly a generating function of the canonical transformation relating the $\si$-models from the dual pair.
Klimcik Ctirad
Severa Pavol
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