Comments on D-brane Interactions in PP-wave Backgrounds

TL;DR

This paper compares D-brane interactions in PP-wave backgrounds using string theory and supergravity, finding consistent brane tensions and RR charges with Minkowski space despite orientation differences.

Contribution

It provides the first detailed calculation of D-brane interaction potentials in PP-wave backgrounds, confirming theoretical expectations from sigma model perturbation theory.

Findings

Brane tensions and RR charges match Minkowski space values in PP-wave backgrounds.

Timelike and spacelike brane orientations exhibit different interaction characteristics.

Results align with predictions from low-energy supergravity and string theory calculations.

Abstract

We calculate the interaction potential between widely separated D-branes in PP-wave backgrounds in string theory as well as in low-energy supergravity. Timelike and spacelike orientations are qualitatively different but in both cases the effective brane tensions and RR charges take the same values as in Minkowski space in accordance with the expectations from the sigma model perturbation theory.