The Coulomb branch of N=4 SYM and dilatonic scions in supergravity

Abstract

We find a parametrically light dilaton in special confining theories in three dimensions. Their duals form what we call a scion of solutions to the supergravity associated with the large-N limit of the Coulomb branch of the N = 4 Super-Yang-Mills (SYM) theory. The supergravity description contains one scalar with bulk mass that saturates the Breitenlohner-Freedman unitarity bound. The new solutions are defined within supergravity, they break supersymmetry and scale invariance, and one dimension is compactified on a shrinking circle, yet they are completely regular. An approximate dilaton appears in the spectrum of background fluctuations (or composite states in the confining theory), and becomes parametrically light along a metastable portion of the scion of new supergravity solutions, in close proximity of a tachyonic instability. A first-order phase transition separates stable backgrounds, for which the approximate dilaton is not parametrically light, from metastable and unstable backgrounds, for which the dilaton becomes parametrically light, and eventually tachyonic. ContentsIV. Mass spectra and probe approximation 9V. Free energy and stability analysis 11 VI. Conclusion and outlook 12Acknowledgments 13A. The two supersymmetric solutions 13 B. Expansions for the fluctuations 14References 15

Towards composite Higgs: minimal coset from a regular bottom-up holographic model

“…[120] focuses on identifying regions of parameter space relevant to understanding the physics of the dilaton, the approximate Goldstone boson associated with scale invariance, along the programmatic lines developed in Refs. [121][122][123][124][125][126], 1 in this publication and in future ones [131,132] we are interested in investigating whether the PNGB states associated with the SO(5)/SO (4) coset have model-building potential in the CHM context.…”