Strong coupling effects can avert excess entropy production in supersymmetric models with a large intermediate scale due to symmetry breaking along a flat direction in the effective potential. This is because strong-coupling effects may break supersymmetry giving a large vacuum energy which destabilizes the symmetric field configuration. Alternatively, the reduced number of degrees of freedom in the confined phase destabilized the symmetric field configuration at a high temperature T≫mw. This principle is exhibited in a simple supersymmetric flipped SU(5)×U(1) GUT model inspired by the superstring. Compatible scenarios for baryosynthesis are briefly discussed.
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We would like to thank L. Corners, A. Deans, S. Kelley, R. Parker, R. Ticciati and G. Veneziano for valuable conversations. B.A.C. thanks the CERN Theory Division for its kind hospitality. His research was supported by NSERC Canada under grant A8863. The work of D.V.N. was supported in part by DOE grant DE-AC02-76ER0081 and in part by the University of Wisconsin Research Committee with funds granted by the Wisconsin Alumni Research Foundation. The work of K.A.O. was supported in part by DOE grant DE-AC02-83ER-40105.