Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1996-11-19
Nucl.Phys. B493 (1997) 27-55
Physics
High Energy Physics
High Energy Physics - Theory
37 pages, LaTeX, 3 postscript figures. Footnote of p.26 and ref.19 are corrected. Ref.16 is updated
Scientific paper
10.1016/S0550-3213(97)00162-4
Using the linear multiplet formulation for the dilaton superfield, we construct an effective lagrangian for hidden-sector gaugino condensation in string effective field theories with arbitrary gauge groups and matter. Nonperturbative string corrections to the K\"ahler potential are invoked to stabilize the dilaton at a supersymmetry breaking minimum of the potential. When the cosmological constant is tuned to zero the moduli are stabilized at their self-dual points, and the vev's of their F-component superpartners vanish. Numerical analyses of one- and two-condensate examples with massless chiral matter show considerable enhancement of the gauge hierarchy with respect to the E_8 case. The nonperturbative string effects required for dilaton stabilization may have implications for gauge coupling unification. As a comparison, we also consider a parallel approach based on the commonly used chiral formulation.
Binetruy Pierre
Gaillard Mary K.
Wu Yi-Yen
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