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

TL;DR

This paper derives supergravity fields for a D-brane with a traveling wave using string amplitudes, establishing a direct link between microscopic states and macroscopic supergravity solutions in type IIB string theory.

Contribution

It introduces a method to compute supergravity fields from string amplitudes for D-branes with traveling waves, connecting microscopic and macroscopic descriptions.

Findings

Reproduces known two-charge supergravity solutions

Establishes a direct link between string amplitudes and supergravity fields

Validates the microscopic-macroscopic correspondence in this context

Abstract

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 frame, providing a direct link between the microscopic bound states and their macroscopic descriptions.