Supersymmetry breaking due to moduli stabilization in string theory
Supersymmetry breaking due to moduli stabilization in string theory
复制标题
弦理论中模稳定导致的超对称破缺
DOI：
10.1103/physrevd.85.066005
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发表时间：
2011
影响因子：
5
通讯作者：
K. Olive
中科院分区：
文献类型：
--
作者：
Andrei Linde;Y. Mambrini;K. Olive
我们考虑固定紧化模的现象学后果。在最简单的KKLT结构中，内部尺寸的稳定性相当软：产生模的弱标度质量，并且是m_\sigma ~ m_{3/2}阶。因此，人们得到了一种在引力和/或异常介导的超对称破缺（AMSB）模型中发现的软超对称破缺质量的模式。这些模型可能会导致早期宇宙内部维度的不稳定，除非膨胀期间的哈勃常数非常小。幸运的是，通过适当选择超势（例如在具有赛道超势的KL模型中）可以实现紧化维度的强稳定化。这使得宇宙学的模量问题的解决方案，并在超引力膨胀的成功实施。我们发现，强模稳定导致一个非常明显的模式软超对称性破缺群众。一般情况下，我们发现软标量质量仍然是引力子质量的量级，而高更子质量在树水平上几乎消失，即它们的量级为m3/2 ^2/m\sigma。辐射修正产生的贡献，让人想起AMSB模型的高根质量和去耦的标量谱让人想起分裂超对称。这需要相对较大的引力子质量~ O（100）TeV，解决了宇宙学引力子问题和AMSB模型中的快子态问题。
We consider the phenomenological consequences of fixing compactification moduli. In the simplest KKLT constructions, stabilization of internal dimensions is rather soft: weak scale masses for moduli are generated, and are of order m_\sigma ~ m_{3/2}. As a consequence one obtains a pattern of soft supersymmetry breaking masses found in gravity and/or anomaly mediated supersymmetry breaking (AMSB) models. These models may lead to destabilization of internal dimensions in the early universe, unless the Hubble constant during inflation is very small. Fortunately, strong stabilization of compactified dimensions can be achieved by a proper choice of the superpotential (e.g in the KL model with a racetrack superpotential). This allows for a solution of the cosmological moduli problem and for a successful implementation of inflation in supergravity. We show that strong moduli stabilization leads a very distinct pattern of soft supersymmetry breaking masses. In general, we find that soft scalar masses remain of order the gravitino mass, while gaugino masses nearly vanish at the tree level, i.e. they are of order m_{3/2}^2/m_\sigma. Radiative corrections generate contributions to gaugino masses reminiscent of AMSB models and a decoupled spectrum of scalars reminiscent of split-supersymmetry. This requires a relatively large gravitino mass ~ O(100) TeV, resolving the cosmological gravitino problem and problems with tachyonic staus in AMSB models.