Phenomenology of mixed modulus-anomaly mediation in fluxed string compactifications and brane models
Phenomenology of mixed modulus-anomaly mediation in fluxed string compactifications and brane models
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DOI：
10.1088/1126-6708/2005/09/039
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发表时间：
2005-04
影响因子：
5.4
通讯作者：
Kiwoon Choi;K. Jeong;Ken-ichi Okumura
中科院分区：
文献类型：
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作者：
Kiwoon Choi;K. Jeong;Ken-ichi Okumura
在一些弦紧化中，例如最近提出的KKLT装置，光模在超对称AdS真空中通过非微扰效应稳定，该超对称AdS真空通过超对称破缺提升势提升到dS真空。在这样的模型中，软超对称破缺项是由一个特定的混合模异常调解，其中两个调解通常给软参数的贡献相当。类似的软项模式也可以出现在膜模型中，通过非微扰效应来稳定放射子。我们研究了这种混合模量异常调解的一些唯象后果，包括低能量sparticle谱的模式和电弱对称性破缺的可能性。值得注意的是，在MGUT增加异常介导的贡献相当于用海市蜃楼信使尺度（m3/2/MPl）取代模量介导的信使尺度？/ 2MGUT在哪里？= m3/2/[M0ln（MP1/m3/2）]，表示模量介导的对MGUT处的Gaugino质量的贡献。最小KKLT设置预测？= 1。因此，对于？=（1），该模型可以导致一个非常独特的模式，在TeV尺度的sparticle质量，特别是当？= 2。
In some string compactifications, for instance the recently proposed KKLT set-up, light moduli are stabilized by nonperturbative effects at supersymmetric AdS vacuum which is lifted to a dS vacuum by supersymmetry breaking uplifting potential. In such models, soft supersymmetry breaking terms are determined by a specific mixed modulus-anomaly mediation in which the two mediations typically give comparable contributions to soft parameters. Similar pattern of soft terms can arise also in brane models to stabilize the radion by nonperturbative effects. We examine some phenomenological consequences of this mixed modulus-anomaly mediation, including the pattern of low energy sparticle spectrum and the possibility of electroweak symmetry breaking. It is noted that adding the anomaly-mediated contributions at MGUT amounts to replacing the messenger scale of the modulus mediation by a mirage messenger scale (m3/2/MPl)?/2MGUT where ? = m3/2/[M0ln (MPl/m3/2)] for M0 denoting the modulus-mediated contribution to the gaugino mass at MGUT. The minimal KKLT set-up predicts ? = 1. As a consequence, for ? = (1), the model can lead to a highly distinctive pattern of sparticle masses at TeV scale, particularly when ? = 2.