Stringy Instanton Effects in Models with Rigid Magnetised D-branes

Details Stringy Instanton Effects in Models with Rigid Magnetised D-branes Stringy Instanton Effects in Models with Rigid Magnetised D-branes

2009-02-10

arxiv.org/abs/0902.1694v3

Physics

High Energy Physics

High Energy Physics - Theory

60 pages. Refs added. Typos corrected in some eqs. Modified comments in subsection 4.1

Scientific paper

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.

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