Stringy Instanton Effects in Models with Rigid Magnetised D-branes
arXiv:0902.1694 · doi:10.1016/j.nuclphysb.2009.03.018
Abstract
We compute instantonic effects in globally consistent T^6/Z2xZ2 orientifold models with discrete torsion and magnetised D-branes. We consider fractional branes and instantons wrapping the same rigid cycles. We clarify and analyse in detail the low-energy effective action on D-branes in these models. We provide explicit examples where instantons induce linear terms in the charged fields, or non-perturbative mass terms are generated. We also find examples where the gauge theory on fractional branes has conformal symmetry at one-loop, broken by instantonic mass terms at a hierarchically small energy scale.
60 pages. Refs added. Typos corrected in some eqs. Modified comments in subsection 4.1
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