Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-09-27
"Recent Developments in General Relativity-Genoa 2000", edited by R. Cianci, R. Collina, M. Francaviglia and P. Fre, Springer-
Physics
High Energy Physics
High Energy Physics - Phenomenology
No Changes, 6 pages, no figures, To appear in the proceedings of the conference, "Recent Developements in General Relativity,
Scientific paper
We discuss supersymmetry breaking mechanisms at the level of low energy N=1 effective heterotic superstring actions that exhibit $SL(2,Z)_T$ target space modular duality or $SL(2,Z)_S$ strong-weak coupling duality. The allowed superpotential forms use the assumption that the source of non-perturbative effects is not specified and as a result represent the most general parametrization of non-perturbative effects. The minimum values of the limits on the parameters in the superpotential may correspond to vacua with vanishing cosmological constant.
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