Almost No-Scale Supergravity
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Abstract
We construct an explicit 5-dimensional supergravity model that realizes the 'no scale' mechanism for supersymmetry breaking, with all moduli stabilized consistently by low-energy dynamics in the effective theory. Supersymmetry is broken by a constant superpotential localized on a brane, and the radion is stabilized by Casimir energy from supergravity and massive hypermultiplets. If the standard model gauge and matter fields are localized on a brane, visible sector supersymmetry breaking is dominated by gravity loops and flavor-violating hypermultiplet loops, and gaugino masses are smaller than scalar masses. A realistic model can be obtained by partly localizing the the standard model gauge fields. In this case visible sector supersymmetry breaking can be gaugino mediated, while masses of the gravitino and gravitational moduli are larger than the weak scale.