High Energy Scattering in the AdS/CFT Correspondence

TL;DR

This paper develops an eikonal approximation for high energy scattering in AdS spacetime, linking it to CFT four-point functions and revealing universal gravitational effects on high spin operators.

Contribution

It generalizes the eikonal approximation to AdS, resums ladder diagrams, and relates the phase shift to CFT operator anomalous dimensions, providing new insights into AdS/CFT high energy behavior.

Findings

Eikonal approximation is extended to AdS spacetime.

Resummation of ladder diagrams yields a phase shift related to CFT data.

Gravitational interactions dominate at high energies and impact parameters in AdS.

Abstract

This work explores the celebrated AdS/CFT correspondence in the regime of high energy scattering in Anti--de Sitter (AdS) spacetime. In particular, we develop the eikonal approximation to high energy scattering in AdS and explore its consequences for the dual Conformal Field Theory (CFT). Using position space Feynman rules, we rederive the eikonal approximation for high energy scattering in flat space. Following this intuitive position space perspective, we then generalize the eikonal approximation for high energy scattering in AdS and other spacetimes. Remarkably, we are able to resum, in terms of a generalized phase shift, ladder and cross ladder Witten diagrams associated to the exchange of an AdS spin j field, to all orders in the coupling constant. By the AdS/CFT correspondence, the eikonal amplitude in AdS is related to the four point function of CFT primary operators in the regime of large 't Hooft coupling, including all terms of the 1/N expansion. We then show that the eikonal amplitude determines the behavior of the CFT four point function for small values of the cross ratios in a Lorentzian regime and that this controls its high spin and dimension conformal partial wave decomposition. These results allow us to determine the anomalous dimension of high spin and dimension double trace primary operators, by relating it to the AdS eikonal phase shift. Finally we find that, at large energies and large impact parameters in AdS, the gravitational interaction dominates all other interactions, as in flat space. Therefore, the anomalous dimension of double trace operators, associated to graviton exchange in AdS, yields a universal prediction for CFT's with AdS gravitational duals.