SIGMA MODEL APPROACH TO THE HETEROTIC STRING THEORY
Ashoke Sen · OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) · 1985
Relation between the equations of motion for the massless fields in the heterotic string theory, and the conformal invariance of the o model describing the propagation of the heterotic string in arbitrary background massless fields is discussed.It is emphasized that this Q model contains complete information about the string theory.Finally we discuss the extension of the Hull-Witten proof of local gauge and Lorentz invariance of the a-model to higher order in cr', and the modification of the transformation laws of the antisymmetric tensor field under these symmetries.Presence of anomaly in the naive N = k supersymmetry transformation is also pointed out in this context.