Glueballs, symmetry breaking and axionic strings in non-supersymmetric deformations of the Klebanov-Strassler background

TL;DR

This paper derives an analytic non-supersymmetric deformation of the warped deformed conifold, enabling the study of axionic strings and symmetry breaking phenomena in the dual gauge theory, with implications for glueball spectra and baryon number symmetry.

Contribution

It provides an explicit analytic solution for a non-supersymmetric deformation of the Klebanov-Strassler background, facilitating the analysis of axionic strings and symmetry breaking in the dual field theory.

Findings

Identification of axionic strings as D-strings in the deformed background

The axion as a massless pseudo-scalar glueball and Goldstone boson

Discussion of symmetry breaking in related supergravity solutions

Abstract

We obtain an analytic solution for an axionic non-supersymmetric deformation of the warped deformed conifold. This allows us to study D-strings in the infrared limit of non-supersymmetric deformations of the Klebanov-Strassler background. They are interpreted as axionic strings in the dual field theory. Following the arguments of [hep-th/0405282], the axion is a massless pseudo-scalar glueball which is present in the supergravity fluctuation spectrum and it is interpreted as the Goldstone boson of the spontaneously broken U(1) baryon number symmetry, being the gauge theory on the baryonic branch. Besides, we briefly discuss about the Pando Zayas-Tseytlin solution where the SU(2) \times SU(2) global symmetry is spontaneously broken. This background has been conjectured to be on the mesonic branch of the gauge theory.