Hierarchies from D-brane Instantons in Globally Defined Calabi-Yau Orientifolds
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We construct the first globally consistent semirealistic type I string vacua on an elliptically fibered manifold where the zero modes of the Euclidean D1-instanton sector allow for the generation of nonperturbative Majorana masses of an intermediate scale. In another class of global models, a D1-brane instanton can generate a Polonyi-type superpotential breaking supersymmetry at an exponentially suppressed scale.
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Date Posted: 25 January 2011
This document has been peer reviewed.