INTERACTION OF MOVING D-BRANES ON ORBIFOLDS

We use the boundary state formalism to study the interaction of two mo ving identical D-branes in the Type II superstring theory compactified on orbifolds. By computing the velocity dependence of the amplitude i n the limit of large separation we can identify the nature of the diff erent forces between the branes. In particular, in the Z(3) orbifold c ase we find a boundary state which is coupled only to the N = 2 gravit on multiplet containing just a graviton and a vector like in the extre mal Reissner-Nordstrom configuration. We also discuss other cases incl uding T-4/Z(2). (C) 1997 Elsevier Science B.V.