Discussion of conifold-cascade-backreaction-Seiberg-baryonic-duality-branch-Klebanov-deformation-Strassler
Stanislav Kuperstein and friends
Vendredi 15/06/2012, 14:15
Salle Claude Itzykson, Bât. 774, Orme des Merisiers
(The speaker cancelled the seminar for health reasons. In his absence we will discuss the recent papers.) \ \ 1. http://arxiv.org/abs/1206.0747 \ IIA Perspective On Cascading Gauge Theory (David Kutasov, Alisha Wissanji) par We study the N=1 supersymmetric cascading gauge theory found in type IIB string theory on p regular and M fractional D3-branes at the tip of the conifold, using the T-dual type IIA description. We reproduce the supersymmetric vacuum structure of this theory, and show that the IIA analog of the non-supersymmetric state found by Kachru, Pearson and Verlinde in the IIB description is metastable in string theory, but the barrier for tunneling to the supersymmetric vacuum goes to infinity in the field theory limit. We also comment on the N=2 supersymmetric gauge theory corresponding to regular and fractional D3-branes on a near-singular K3, and clarify the origin of the cascade in this theory. \ \ 2. http://arxiv.org/abs/1206.0754 \ Soft branes in supersymmetry-breaking backgrounds (Paul McGuirk, Gary Shiu, Fang Ye) par We revisit the analysis of effective field theories resulting from non-supersymmetric perturbations to supersymmetric flux compactifications of the type-IIB superstring with an eye towards those resulting from the backreaction of a small number of anti-D3-branes. Independently of the background, we show that the low-energy Lagrangian describing the fluctuations of a stack of probe D3-branes exhibits soft supersymmetry breaking, despite perturbations to marginal operators that were not fully considered in some previous treatments. We take this as an indication that the breaking of supersymmetry by anti-D3-branes or other sources may be spontaneous rather than explicit. In support of this, we consider the action of an anti-D3-brane probing an otherwise supersymmetric configuration and identify a candidate for the corresponding goldstino.
Contact : Iosif BENA


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