O(2,2) Transformations and the String Geroch Group

Details O(2,2) Transformations and the String Geroch Group O(2,2) Transformations and the String Geroch Group

1994-02-03

arxiv.org/abs/hep-th/9402016v1

Nucl.Phys. B428 (1994) 374-398

Physics

High Energy Physics

High Energy Physics - Theory

Latex, 26p., CERN-TH.7144/94

Scientific paper

10.1016/0550-3213(94)90205-4

The 1--loop string background equations with axion and dilaton fields are shown to be integrable in four dimensions in the presence of two commuting Killing symmetries and $\delta c = 0$. Then, in analogy with reduced gravity, there is an infinite group that acts on the space of solutions and generates non--trivial string backgrounds from flat space. The usual $O(2,2)$ and $S$--duality transformations are just special cases of the string Geroch group, which is infinitesimally identified with the $O(2,2)$ current algebra. We also find an additional $Z_{2}$ symmetry interchanging the field content of the dimensionally reduced string equations. The method for constructing multi--soliton solutions on a given string background is briefly discussed.

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