6d holographic anomaly match as a continuum limit

TL;DR

This paper demonstrates a precise match between holographic Weyl anomalies in a class of AdS_7 solutions and their dual linear quiver field theories, interpreting the large gauge group limit as a continuum limit of the discrete data.

Contribution

It provides a detailed quantitative check of the holographic duality by relating the field theory anomaly calculations to the geometric continuum limit of the internal space.

Findings

Holographic and field theory Weyl anomalies agree quantitatively.

The large gauge group limit corresponds to a continuum limit of the discrete data.

The inverse Cartan matrix acts as a second derivative in the continuum limit.

Abstract

An infinite class of analytic AdS_7 x S^3 solutions has recently been found. The S^3 is distorted into a "crescent roll" shape by the presence of D8-branes. These solutions are conjectured to be dual to a class of "linear quivers", with a large number of gauge groups coupled to (bi-)fundamental matter and tensor fields. In this paper we perform a precise quantitative check of this correspondence, showing that the a Weyl anomalies computed in field theory and gravity agree. In the holographic limit, where the number of gauge groups is large, the field theory result is a quadratic form in the gauge group ranks involving the inverse of the A_N Cartan matrix C. The agreement can be understood as a continuum limit, using the fact that C is a lattice analogue of a second derivative. The discrete data of the field theory, summarized by two partitions, become in this limit the continuous functions in the geometry. Conversely, the geometry of the internal space gets discretized at the quantum level to the discrete data of the two partitions.