Double Field Theory of Type II Strings

Details Double Field Theory of Type II Strings Double Field Theory of Type II Strings

2011-06-30

arxiv.org/abs/1107.0008v2

Physics

High Energy Physics

High Energy Physics - Theory

63 pages, v2: minor corrections, to appear in JHEP

Scientific paper

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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