Abstract
In this Ph.D. thesis, accepted at the Vrije Universiteit Brussel, we review and elaborate on a method to find the Dβbrane effective action, based on BPS equations. Firstly, both for the YangβMills action and the BornβInfeld action it is shown that these configurations are indeed BPS, i.e. solutions to these equations saturate a Bogomolny bound and leave some supersymmetry unbroken. Next, we use the BPS equations as a tool to construct the Dβbrane effective action and require that (a deformation of) these equations should still imply the equations of motion in more general cases. In the abelian case we managed to calculate all order in Ξ±β² fourβderivative corrections to the effective action and the BPS equations while in the nonβabelian case we obtained the effective action up to order Ξ±β²^4^. Furthermore, we discuss a check based on the spectrum of strings stretching between intersecting branes. Finally, this Ph.D. thesis also discusses the construction of a boundary superspace which would be the first step to use the method of Weyl invariance in N = 2 superspace in order to again construct the Dβbrane effective action. A more detailed summary of each section can be found in the introduction.