Wrapped Magnetized Branes: Two Alternative Descriptions?

Understand

We discuss two inequivalent ways for describing magnetized D-branes wrapped N times on a torus T^2.

• The first one is based on a non-abelian gauge bundle U(N), while the second one is obtained by means of a Narain T-duality transformation acting on a theory with non-magnetized branes.
• We construct in both descriptions the boundary state and the open string vertices and show that they give rise to different string amplitudes.
• In particular, the description based on the gauge bundle has open string vertex operators with momentum dependent Chan-Paton factors.