Light scalar modes from holographic deformations

TL;DR

This paper explores how different holographic deformations, specifically single- and multitrace, can produce a lighter scalar mode in strongly coupled confining gauge theories, with multitrace deformation effectively isolating a light composite state.

Contribution

It demonstrates that multitrace deformations can generate a purely light composite scalar mode, unlike single-trace deformations which produce mixed states.

Findings

Multitrace deformation yields a purely light composite mode.

Single-trace deformation results in a mixed elementary and composite mode.

The approach modifies the mass spectrum in holographic models.

Abstract

We consider different ways of modifying the mass spectrum of a strongly coupled gauge theory with confinement using the AdS/CFT correspondence. Single- and multitrace deformations are introduced, such that the resulting theory has a mode lighter than the confinement scale. The multitrace deformation is shown to be a possible way of achieving a light composite mode, unlike the single-trace deformation where the light mode is an admixture of elementary and composite states.