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Double double geometry

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We recall that in the STU model, with axion/dilaton S, 2-torus complex structute T and Kahler form U, doubling the target space of the fundamental string from 2 dimensions to 4 renders manifest the SL(2)_T x SL(2)_U by combining worldsheet field equations and Bianchi identities [1] and that doubling the target space of the dual string from 2 dimensions to 4 renders manifest the SL(2)_S X SL (2)_U via the duality of dualities that interchanges S and T [2]. Here we show that the further doubling from 4 dimensions to 8 renders manifest the complete SL(2)_S x SL(2)_T x SL(2)_U and S-T-U triality by combining fields equations and Bianchi identities of all three S-, T- and U-strings [3].

[1] M.J. Duff, ``Duality Rotations In String Theory’’, Nucl. Phys. B335 (1990) 610

[2] M.J. Duff, ’’Strong / weak coupling duality from the dual string’’, Nucl. Phys. B442 (1995) 47-63, hep-th/9501030 (written at Newton!)

[3] L. Borsten, M. J. Duff, L. Hughes and S. Nagey (to appear)

This talk is part of the Isaac Newton Institute Seminar Series series.

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