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

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 agbainst the semiclassical dynamics of high-energy strings in the external p-brane backgound By changing the energy, impact parameter and effective open string coupling lambda = gN, we are able to explore various interesting regimes and to reproduce classical expectations, including tidal-force excitations, even beyond the leading-erkonal approximation.