Abstract
We investigate the stability of the hidden sector gaugino condensate in a SL(2, Z)-invariant supergravity model inspired by E 8⊗E 8 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.
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