A NOTE ON DISCRETE SYMMETRIES IN TOROIDAL COMPACTIFICATIONS OF STRINGS
M. A. R. Osorio · Modern Physics Letters A · 1990
In this paper we look for discrete invariances of the partition function in toroidal compactifications of strings. We show that besides world-sheet modular invariance, the partition function is invariant under GL (2d, ℤ) transformations ( GL (2d + 16, ℤ) when Wilson lines are present) acting upon the instanton contribution.