High-energy string-brane scattering: leading eikonal and beyond

TL;DR

This paper extends techniques for high-energy string collisions to analyze massless closed string scattering from Dp-branes, revealing an effective metric and exploring regimes beyond leading eikonal approximation.

Contribution

It introduces a method to derive an effective metric from string amplitudes and explores various regimes of high-energy string-brane interactions beyond leading order.

Findings

Effective non-trivial metric emerges from string amplitudes.

Classical expectations like tidal-force excitations are reproduced.

Analysis extends beyond the leading eikonal approximation.

Abstract

We extend previous techniques for calculations of transplanckian-energy string-string collisions to the high-energy scattering of massless closed strings from a stack of N Dp-branes in Minkowski spacetime. We show that an effective non-trivial metric emerges from the string scattering amplitudes by comparing them against the semiclassical dynamics of high-energy strings in the extremal p-brane background. By changing the energy, impact parameter and effective open string coupling, we are able to explore various interesting regimes and to reproduce classical expectations, including tidal-force excitations, even beyond the leading-eikonal approximation.