Peter Ouyang

Holomorphic D7-branes and flavored N=1 gauge theories

Abstract We consider D7-branes in the gauge theory/string theory correspondence, using a probe approximation. The D7-branes have four directions embedded holomorphically in a non-compact Calabi–Yau 3-fold (which for specificity we take to be the conifold) and their remaining four directions are parallel to a stack of D3-branes transverse to the Calabi–Yau space. The dual gauge theory, which has N = 1 supersymmetry, contains quarks which transform in the fundamental representation of the gauge group, and we identify the interactions of these quarks in terms of a superpotential. By activating three-form fluxes in the gravity background, we obtain a dual gauge theory with a cascade of Seiberg dualities. We find a supersymmetric supergravity solution for the leading backreaction effects of the D7-branes, valid for large radius. The cascading theory with flavors exhibits the interesting phenomenon that the rate of the cascade slows and can stop as the theory flows to the infrared.

D-Branes On The Conifold And N = 1 Gauge/Gravity Dualities

We review extensions of the AdS/CFT correspondence to gauge/ gravity dualities with N = 1 supersymmetry. In particular, we describe the gauge/gravity dualities that emerge from placing D3-branes at the apex of the conifold. We consider first the conformai case, with discussions of chiral primary operators and wrapped D-branes. Next, we break the conformai symmetry by adding a stack of partially wrapped D5-branes to the system, changing the gauge group and introducing a logarithmic renormalization group flow. In the gravity dual, the effect of these wrapped D5-branes is to turn on the flux of 3-form field strengths. The associated RR 2-form potential breaks the U(1) R-symmetry to ℤ2M and we study this phenomenon in detail. This extra flux also leads to deformation of the cone near the apex, which describes the chiral symmetry breaking and confinement in the dual gauge theory.

Gravity dual of the chiral anomaly

We study effects associated with the chiral anomaly for a cascading

Fractional D1-branes at finite temperature

\mathrm{SU}(N+M)\ifmmode\times\else\texttimes\fi{}\mathrm{SU}(N)

DO CHIRAL SOLITON MODELS PREDICT PENTAQUARKS

gauge theory using gauge/gravity duality. In the gravity dual the anomaly is a classical feature of the supergravity solution, and the breaking of the

Remarks on the warped deformed conifold

U(1) R

Is Θ+(1540) a kaon–skyrmion resonance?

symmetry down to

Toward Higher Spin dS3/CFT2

{\mathbf{Z}}_{2M}

Semiclassical Quantization of Giant Gravitons

proceeds via the Higgs mechanism.

Is T +(1540) a kaonskyrmion resonance?

Abstract The supergravity dual of N regular and M fractional D1-branes on the cone over the Einstein manifold Q 1,1,1 has a naked singularity in the infrared. The supergravity dual of N regular and M fractional D3-branes on the conifold also has such a singularity. Buchel suggested and Gubser et al. have shown that in the D3-brane case, the naked singularity is cloaked by a horizon at a sufficiently high temperature. In this paper we derive the system of second-order differential equations necessary to find such a solution for Q 1,1,1 . We also find solutions to this system in perturbation theory that are valid when the Hawking temperature of the horizon is very high.