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arXiv 0710.4577hep-th
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无标度超对称破缺真空与挠率软项

No-scale supersymmetry breaking vacua and soft terms with torsion

Pablo G. Cámara, Mariana Graña

摘要:

分析了IIA型和IIB型超引力场的无标度超对称破缺解在SU(3)结构流形上紧化的条件。超对称性被内部空间的内禀挠率自发破缺。对于具有O_9和O_5平面的IIB型定向褶皱,引力子的质量由挠类W_1控制,破缺是通过与原始N = 2超多重态的后代相关联的F项介导的。对于IIA型orientifolds与O6-平面,我们发现两个家庭的解决方案,这取决于是否打破介导完全由超多重峰或混合的超多重峰和向量多重峰,后者的情况下对应的一类Scherk-Schwarz紧化不对偶的任何几何IIB设置。我们计算了扭曲环面上的D5,D6和D9-膜的几何诱导的μ-项,并讨论了纯模调解中出现的软项的模式。对于D3和D7-膜,在3-形式通量的存在下,有效标量势具有有趣的唯象性质。

英文摘要:

We analyze the conditions to have no-scale supersymmetry breaking solutions of type IIA and IIB supergravity compactified on manifolds of SU(3)-structure. The supersymmetry is spontaneously broken by the intrinsic torsion of the internal space. For type IIB orientifolds with O9 and O5-planes the mass of the gravitino is governed by the torsion class W_1, and the breaking is mediated through F-terms associated to descendants of the original N=2 hypermultiplets. For type IIA orientifolds with O6-planes we find two families of solutions, depending on whether the breaking is mediated exclusively by hypermultiplets or by a mixture of hypermultiplets and vector multiplets, the latter case corresponding to a class of Scherk-Schwarz compactifications not dual to any geometric IIB setup. We compute the geometrically induced mu-terms for D5, D6 and D9-branes on twisted tori, and discuss the patterns of soft-terms which arise for pure moduli mediation in each type of breaking. As for D3 and D7-branes in presence of 3-form fluxes, the effective scalar potential turns out to possess interesting phenomenological properties.

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