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arXiv 1012.1858hep-thhep-ph
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字符串紧化中的隔离

Sequestering in String Compactifications

Marcus Berg, David Marsh, Liam McAllister, Enrico Pajer

摘要:

我们研究了弦紧化中超对称破缺的中介作用,弦紧化的模是由非微扰效应稳定的。我们首先对超引力和弦论中的隔离论证进行批判性的回顾。然后,我们表明,几何隔离,即使在一个高度扭曲的空间,是不足以实现隔离:在IIB型紧化,非微扰的超势涉及的卡勒模量引入交叉耦合以及分离的可见和隐藏的部门之间。由此产生的软条款的规模取决于模量稳定的情况。在大体积情形下,非微扰超势对软三线性$A$项的贡献可以引入显著的味违反,而在KKLT紧化中,它们的影响可以忽略不计。在这两种情况下,对$μ$和$Bμ$参数的贡献通常不能忽略。我们的结论是,隔离的超对称性破缺是可能的非微扰稳定的紧致化,只有当一个机制,除了体局部抑制超势交叉耦合。

英文摘要:

We study the mediation of supersymmetry breaking in string compactifications whose moduli are stabilized by nonperturbative effects. We begin with a critical review of arguments for sequestering in supergravity and in string theory. We then show that geometric isolation, even in a highly warped space, is insufficient to achieve sequestering: in type IIB compactifications, nonperturbative superpotentials involving the Kahler moduli introduce cross-couplings between well-separated visible and hidden sectors. The scale of the resulting soft terms depends on the moduli stabilization scenario. In the Large Volume Scenario, nonperturbative superpotential contributions to the soft trilinear $A$ terms can introduce significant flavor violation, while in KKLT compactifications their effects are negligible. In both cases, the contributions to the $μ$ and $Bμ$ parameters cannot be ignored in general. We conclude that sequestered supersymmetry breaking is possible in nonperturbatively-stabilized compactifications only if a mechanism in addition to bulk locality suppresses superpotential cross-couplings.

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