We construct the order α ′ 3 terms in the supersymmetric Yang-Mills action in ten dimensions for an arbitrary gauge group. The result can be expressed in terms of the structure constants of the… (More)

We construct the supersymmetric effective action at order α ′ 4 of the abelian open superstring. It includes the α ′ 4 terms in the abelian Born-Infeld action, and in particular the leading… (More)

We construct the derivative corrections to the four-point vertices in the abelian open string effective action to all orders in α ′. The result is based on the structure of the string four-point… (More)

We give a classification of all multiple intersections of D-branes in ten dimensions and M-branes in eleven dimensions that correspond to threshold BPS bound states. The residual supersymmetry of… (More)

We employ T-duality to restrict the tachyon dependence of effective actions for non-BPS D-branes. For the Born-Infeld part the criteria of T-duality and supersymmetry are satisfied by a simple… (More)

We consider two inequivalent truncations of the super D9–brane: the “Heterotic” and the “Type I” truncation. Both of them lead to an N = 1 nonlinear supersymmetrization of the D = 10 cosmological… (More)

We show that IIA supergravity can be extended with two independent 10-form potentials. These give rise to a single BPS IIA 9-brane. We investigate the bosonic gauge algebra of both IIA and IIB… (More)

We define an iterative procedure to obtain a non-abelian generalization of the Born-Infeld action. This construction is made possible by the use of the severe restrictions imposed by kappa-symmetry.… (More)

We perform a generalised Scherk-Schwarz reduction of the effective action of the het-erotic string on T 6 to obtain a massive N = 4 supergravity theory in four dimensions. The local symmetry-group of… (More)

We consider intersections in eleven dimensions involving Kaluza-Klein monopoles and Brinkmann waves. Besides these purely gravitational configurations we also construct solutions to the equations of… (More)