The holographic dilaton

TL;DR

This paper investigates holographic duals of theories with spontaneous conformal symmetry breaking, demonstrating the existence of a massless dilaton pole through detailed two-point function calculations.

Contribution

It revises previous results on dilaton poles in holographic models and confirms the presence of a massless dilaton in the spectrum.

Findings

Confirmed the existence of a massless dilaton pole in two-point functions.

Revised previous holographic results to account for the dilaton pole.

Provided detailed calculations of energy-momentum and scalar correlators.

Abstract

We study a set of examples of holographic duals to theories with spontaneous breaking of conformal invariance in different dimensions. The geometries are domain walls interpolating between two AdS spaces, with a non-trivial background scalar field dual to a relevant operator. We comment on a subtlety in the low momentum expansion pointed out in arXiv:1304.3051 for the case of background gravity and revise the dynamical gravity results of arXiv:1207.0006, where the dilaton pole was missing in the scalar-scalar and tensor-tensor two-point functions. We compute the energy-momentum tensor and scalar two-point functions and show that there is indeed a massless dilaton pole.