Double field theory of type II strings
- First Online:
- Cite this article as:
- Hohm, O., Kwak, S.K. & Zwiebach, B. J. High Energ. Phys. (2011) 2011: 13. doi:10.1007/JHEP09(2011)013
- 57 Views
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.