Eikonal approximation in AdS/CFT: from shock waves to four-point functions

L Cornalba, MS Costa, J Penedones… - Journal of High Energy …, 2007 - iopscience.iop.org
L Cornalba, MS Costa, J Penedones, R Schiappa
Journal of High Energy Physics, 2007iopscience.iop.org
We initiate a program to generalize the standard eikonal approximation to compute
amplitudes in Anti-de Sitter spacetimes. Inspired by the shock wave derivation of the eikonal
amplitude in flat space, we study the two-point function Script E∼⟨ Script O 1 Script O 1⟩
shock in the presence of a shock wave in Anti-de Sitter, where Script O 1 is a scalar primary
operator in the dual conformal field theory. At tree level in the gravitational coupling, we
relate the shock two-point function Script E to the discontinuity across a kinematical branch …
Abstract
We initiate a program to generalize the standard eikonal approximation to compute amplitudes in Anti-de Sitter spacetimes. Inspired by the shock wave derivation of the eikonal amplitude in flat space, we study the two-point function Script E∼⟨ Script O 1 Script O 1⟩ shock in the presence of a shock wave in Anti-de Sitter, where Script O 1 is a scalar primary operator in the dual conformal field theory. At tree level in the gravitational coupling, we relate the shock two-point function Script E to the discontinuity across a kinematical branch cut of the conformal field theory four-point function Script A∼⟨ Script O 1 Script O 2 Script O 1 Script O 2⟩, where Script O 2 creates the shock geometry in Anti-de Sitter. Finally, we extend the above results by computing Script E in the presence of shock waves along the horizon of Schwarzschild BTZ black holes. This work gives new tools for the study of Planckian physics in Anti-de Sitter spacetimes.
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