Supergravity description of non-Bogomol'nyi-Prasad-Sommerfield branes

We construct supergravity solutions that correspond to N Dp-branes coinciding with N D/sub p/-branes. We study the physical properties of the solutions and analyze the supergravity description of tachyon condensation. We construct an interpolation between the brane- antibrane solution and the Schwarzschild solution and discuss its possible application to the study of non-supersymmetric black holes. (37 refs)