Wa. Sabra et al., SPECIAL GEOMETRY AND TWISTED MODULI IN ORBIFOLD THEORIES WITH CONTINUOUS WILSON LINES, Modern physics letters A, 11(16), 1996, pp. 1307-1316
Target space duality symmetries, which acts on Kahler and continuous W
ilson line moduli, of a Z(N) (N not equal 2) two-dimensional subspace
of the moduli space of orbifoid compactification are modified to inclu
de twisted moduli. These spaces described by the cosets SU(n,1)/SU(n)x
(1) are special Kahler, a fact which is exploited in deriving the exte
nsion of tree level duality transformation to include higher orders of
the twisted moduli. Also, restrictions on these higher order terms ar
e derived.