Differential geometry with a projection: application to double field theory

  • Imtak Jeon
  • Kanghoon Lee
  • Jeong-Hyuck Park


In recent development of double field theory, as for the description of the massless sector of closed strings, the spacetime dimension is formally doubled, i.e. from D to D+D, and the T-duality is realized manifestly as a global O(D, D) rotation. In this paper, we conceive a differential geometry characterized by a O(D, D) symmetric projection, as the underlying mathematical structure of double field theory. We introduce a differential operator compatible with the projection, which, contracted with the projection, can be covariantized and may replace the ordinary derivatives in the generalized Lie derivative that generates the gauge symmetry of double field theory. We construct various gauge covariant tensors which include a scalar and a tensor carrying two O(D, D) vector indices.


String Duality Bosonic Strings 


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Copyright information

© SISSA, Trieste, Italy 2011

Authors and Affiliations

  1. 1.Center for Quantum SpacetimeSogang UniversitySeoulKorea
  2. 2.Department of PhysicsSogang UniversitySeoulKorea

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