CFT in AdS and boundary RG flows

TL;DR

This paper explores boundary conformal field theories (BCFTs) via their AdS duals, computing free energies and correlation functions to verify the boundary F-theorem and extract BCFT data, especially in the large N critical O(N) model.

Contribution

It demonstrates how AdS methods can be used to analyze BCFT boundary flows, compute free energies, and derive BCFT data, confirming the boundary F-theorem across dimensions.

Findings

AdS free energy decreases along boundary RG flows.

Computed boundary fixed point free energies consistent with the F-theorem.

Derived BCFT data such as anomalous dimensions of boundary operators.

Abstract

Using the fact that flat space with a boundary is related by a Weyl transformation to anti-de Sitter (AdS) space, one may study observables in boundary conformal field theory (BCFT) by placing a CFT in AdS. In addition to correlation functions of local operators, a quantity of interest is the free energy of the CFT computed on the AdS space with hyperbolic ball metric, i.e. with a spherical boundary. It is natural to expect that the AdS free energy can be used to define a quantity that decreases under boundary renormalization group (RG) flows. We test this idea by discussing in detail the case of the large $N$ critical $O(N)$ model in general dimension $d$, as well as its perturbative descriptions in the epsilon-expansion. Using the AdS approach, we recover the various known boundary critical behaviors of the model, and we compute the free energy for each boundary fixed point, finding results which are consistent with the conjectured $F$-theorem in a continuous range of dimensions. Finally, we also use the AdS setup to compute correlation functions and extract some of the BCFT data. In particular, we show that using the bulk equations of motion, in conjunction with crossing symmetry, gives an efficient way to constrain bulk two-point functions and extract anomalous dimensions of boundary operators.