Complex world sheets from N=2 strings

@article{Barbn1996ComplexWS,
  title={Complex world sheets from N=2 strings},
  author={J. L. F. Barb{\'o}n and Miguel Angel Vazquez-Mozo},
  journal={Nuclear Physics},
  year={1996},
  volume={475},
  pages={244-270}
}
Abstract We study some properties of target space strings constructed from (2,1) heterotic strings. We argue that world-sheet complexification is a general property of the bosonic sector of such target world-sheets. We give a target space interpretation of this fact and relate it to the non-gaussian nature of free String Field Theory. We provide several one-loop calculations supporting the stringy construction of critical world-sheets in terms of (2,1) models. Using finite-temperature boundary… 
Geometrical Structures of M-Theory
N=(2,1) heterotic string theory provides clues about hidden structure in M-theory related to string duality; in effect it geometrizes some aspects of duality. The program whereby one may deduce this

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