New Compactifications of Supergravities and Large N QCD

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 $Ad{S}_7\times S^4$ or $Ad{S}_5\times S^5$ 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.

two small misprints corrected, to appear in Nucl.Phys.B, 17 pages, harvmac

References in corpus (3)

• Wilson loops in large N field theories
• Aspects of Large N Gauge Theory Dynamics as Seen by String Theory
• Einstein spaces in five and seven dimensions and non-supersymmetric gauge theories

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