Stringy Instanton Effects in Models with Rigid Magnetised D-branes

Understand

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.