New Compactifications of Supergravities and Large N QCD

TL;DR

This paper develops new supergravity backgrounds with non-homogeneous compactifications that enable a generalized holographic QCD model with additional parameters, expanding the flexibility of previous models.

Contribution

It introduces novel non-homogeneous supergravity compactifications that extend holographic QCD models with extra parameters and reduced supersymmetry.

Findings

Constructed regular supergravity backgrounds with non-homogeneous compactifications.

These backgrounds approach $AdS_7\times S^4$ or $AdS_5\times S^5$ at infinity.

Enabled a generalized QCD model with additional parameters.

Abstract

We construct supergravity backgrounds representing non-homogeneous compactifications of d=10,11 supergravities to four dimensions, which cannot be written as a direct product. The geometries are regular and approach $AdS_7\times S^4$ or $AdS_5\times S^5$ at infinity; they are generically non-supersymmetric, except in a certain "extremal" limit, where a Bogomol'nyi bound is saturated and a naked singularity appears. By using these spaces, one can construct a model of QCD that generalizes by one (or two) extra parameters a recently proposed model of QCD based on the non-extremal D4 brane. This allows for some extra freedom to circumvent some (but not all) limitations of the simplest version.