  We study the process of bound state formation in a D-brane collision. We
consider two mechanisms for bound state formation. The first, operative at weak
coupling in the worldvolume gauge theory, is pair creation of W-bosons. The
second, operative at strong coupling, corresponds to formation of a large black
hole in the dual supergravity. These two processes agree qualitatively at
intermediate coupling, in accord with the correspondence principle of Horowitz
and Polchinski. We show that the size of the bound state and timescale for
formation of a bound state agree at the correspondence point. The timescale
involves matching a parametric resonance in the gauge theory to a quasinormal
mode in supergravity.
