Interaction of dynamical fractional branes with background fields: Superstring calculations

Abstract

We compute the boundary state corresponding to a fractional Dp-brane with transverse motion and internal background fields: Kalb-Ramond and a U (1) gauge field. The spacetime has the orbifold structure R 1,5 × C 2 /Z 2 . The calculations are in the superstring theory. Using this boundary state we shall obtain the interaction amplitude between two parallel moving fractional Dp-branes. We shall extract behavior of the interaction amplitude for large distances of the branes.