The General twisted open WZW string

@article{Halpern2005TheGT,
  title={The General twisted open WZW string},
  author={Martin B. Halpern and Craig Helfgott},
  journal={International Journal of Modern Physics A},
  year={2005},
  volume={20},
  pages={923-992}
}
We recently studied two large but disjoint classes of twisted open WZW strings: the open-string sectors of the WZW orientation orbifolds and the so-called basic class of twisted open WZW strings. In this paper, we discuss all T-dualizations of the basic class to construct the general twisted open WZW string — which includes the disjoint classes above as special cases. For the general case, we give the branes and twisted noncommutative geometry at the classical level and the twisted open-string… 

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