Abstract
We use double field theory to give a unified description of the low energy limits of type IIA and type IIB superstrings. The Ramond-Ramond potentials fit into spinor representations of the duality group O(D, D) and field-strengths are obtained by acting with the Dirac operator on the potentials. The action, supplemented by a Spin+ (D, D)-covariant self-duality condition on field strengths, reduces to the IIA and IIB theories in different frames. As usual, the NS-NS gravitational variables are described through the generalized metric. Our work suggests that the fundamental gravitational variable is a hermitian element of the group Spin(D, D) whose natural projection to O(D, D) gives the generalized metric.
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ArXiv ePrint: 1107.0008
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Hohm, O., Kwak, S.K. & Zwiebach, B. Double field theory of type II strings. J. High Energ. Phys. 2011, 13 (2011). https://doi.org/10.1007/JHEP09(2011)013
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DOI: https://doi.org/10.1007/JHEP09(2011)013