Graviton multi-point functions at the AdS boundary

TL;DR

This paper develops a method to construct connected multi-point graviton functions in AdS space, enabling discrimination between Einstein gravity and string theory corrections via gauge-gravity duality.

Contribution

It introduces a way to compute connected graviton functions in a specific kinematic regime, facilitating comparison of Einstein and string-corrected gravity theories.

Findings

Connected graviton functions can be derived from one-particle irreducible amplitudes.

Agreement between different amplitude types suggests a universal feature for Einstein and corrected theories.

Field-theory correlators can be directly obtained from the bulk Lagrangian.

Abstract

The gauge-gravity duality can be used to relate connected multi-point graviton functions to connected multi-point correlation functions of the stress tensor of a strongly coupled fluid. Here, we show how to construct the connected graviton functions for a particular kinematic regime that is ideal for discriminating between different gravitational theories; in particular, between Einstein theory and its leading-order string theory correction. Our analysis begins with the one-particle irreducible graviton amplitudes in an anti-de Sitter black brane background. We show how these can be used to calculate the connected graviton functions and demonstrate that the two types of amplitudes agree in some cases. It is then asserted on physical grounds that this agreement persists in all cases for both Einstein gravity and its leading-order correction. This outcome implies that the corresponding field-theory correlation functions can be read directly off from the bulk Lagrangian, just as can be done for the ratio of the shear viscosity to the entropy density.