Moduli spaces and target space duality symmetries in (0,2)Z_N orbifold theories with continuous Wilson lines

We present the coset structure of the untwisted moduli space of heterotic (0,2) Z_N orbifold compactifications with continuous Wilson lines. For the cases where the internal 6-torus T_6 is given by the direct sum T_4 + T2, we explicitly construct the Kaehler potentials associated with the underlying 2-torus T_2. We then discuss the transformation properties of these Kaehler potentials under target space modular symmetries. For the case where the Z_N twist possesses eigenvalues of -1, we find that holomorphic terms occur in the Kaehler potential describing the mixing of complex Wilson moduli. As a consequence, the associated T and U moduli are also shown to mix under target space modular transformations. (orig.)Available from TIB Hannover: RA 2999(94-080) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman