Abstract :
We investigate the stability of the hidden sector gaugino condensate in a SL(2,Z)-invariant supergravity model inspired by E8⊗E8 heterotic string, using the chiral superfield formalism. We calculate Planck-suppressed corrections to the “truncated approximation” for the condensate value and scalar potential. A transition to a phase with zero condensate occurs near special points in moduli space and at large compactification radius. We discuss the implications for the T-modulus dependence of supersymmetry-breaking.
