NS Three-form Flux Deformation for the Critical Non-Abelian Vortex String

TL;DR

This paper investigates how NS three-form flux affects the geometry of a critical non-Abelian vortex string in 4D N=2 SQCD, revealing a potential that causes a runaway vacuum and relates to quark mass deformations.

Contribution

It introduces a detailed analysis of the back reaction of NS three-form flux on the conifold geometry, extending previous work by solving gravity equations with warp factors.

Findings

3-form flux induces a potential for the conifold complex structure modulus.

The potential leads to a runaway vacuum where warp factors vanish.

The vacuum behavior corresponds to decoupling flavors in 4D SQCD.

Abstract

It has been shown that non-Abelian solitonic vortex string supported in four-dimensional (4D) N = 2 supersymmetric QCD (SQCD) with the U(2) gauge group and $N_f = 4$ quark flavors becomes a critical superstring. This string propagates in the ten-dimensional space formed by a product of the flat 4D space and an internal space given by a Calabi-Yau noncompact threefold, namely, the conifold. The spectrum of low lying closed string states in the associated type IIA string theory was found and interpreted as a spectrum of hadrons in 4D N = 2 SQCD. In particular, the lowest string state appears to be a massless BPS baryon associated with the deformation of the complex structure modulus $b$ of the conifold. In the previous work the deformation of the 10-dimensional background with nonzero Neveu-Schwarz 3-form flux was considered and interpreted as a switching on a particular choice of quark masses in 4D SQCD. This deformation was studied to the leading order at small 3-form flux. In this paper we study the back reaction of the nonzero 3-form flux on the metric and the dilaton introducing ansatz with several warp factors and solving gravity equations of motion. We show that 3-form flux produces a potential for the conifold complex structure modulus $b$, which leads to the runaway vacuum. At the runaway vacuum warp factors disappear, while the conifold degenerates. In 4D SQCD we relate this to the flow to the U(1) gauge theory upon switching on quark masses and decoupling of two flavors.