The supergravity fields for a D-brane with a travelling wave from string amplitudes

We calculate the supergravity fields sourced by a D-brane with a null travelling wave from disk amplitudes in type IIB string theory compactified on T-4 x S-1. The amplitudes reproduce all the non-trivial features of the previously known two-charge supergravity solutions in the D-brane/momentum duality frame, providing a direct link between the microscopic bound states and their macroscopic descriptions. (C) 2010 Elsevier B.V. All rights reserved.