Y-system for Scattering Amplitudes

TL;DR

This paper develops a method to compute planar scattering amplitudes in N=4 Super Yang Mills at strong coupling by relating minimal surfaces in AdS space to TBA equations, enabling analysis of any number of gluons and configurations.

Contribution

It introduces a novel approach linking minimal surface areas to TBA equations for arbitrary gluon numbers and kinematics in AdS/CFT correspondence.

Findings

Derived TBA equations for scattering amplitudes

Expressed amplitude area as free energy of TBA system

Applicable to any number of gluons and kinematic configurations

Abstract

We compute N=4 Super Yang Mills planar amplitudes at strong coupling by considering minimal surfaces in AdS_5 space. The surfaces end on a null polygonal contour at the boundary of AdS. We show how to compute the area of the surfaces as a function of the conformal cross ratios characterizing the polygon at the boundary. We reduce the problem to a simple set of functional equations for the cross ratios as functions of the spectral parameter. These equations have the form of Thermodynamic Bethe Ansatz equations. The area is the free energy of the TBA system. We consider any number of gluons and in any kinematic configuration.