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arXiv 1104.3274hep-phhep-th
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超对称破缺与反常U(1)规范对称性的混合介导

Mixed Mediation of Supersymmetry Breaking with Anomalous U(1) Gauge Symmetry

Kiwoon Choi, Kwang Sik Jeong, Ken-Ichi Okumura, Masahiro Yamaguchi

摘要:

具有反常U(1)规范对称性的模型包含各种超场,这些超场可以具有非零超对称性破缺辅助分量,这些辅助分量提供可见扇区中软项的起源,例如U(1)矢量超场、实现格林-施瓦茨反常抵消机制的模或声子超场、抵消费耶特-伊利奥普洛斯项所需的U(1)带电但标准模型单线态物质超场,最后是超重力多重态。我们在一类简单的模型中研究了这些超对称破缺分量之间的相对强度,发现各种不同的超对称破缺的混合中介,包括模量、规范、反常和D项中介,可以根据D平坦方向的特性以及这些D平坦方向如何随着宇宙学常数的消失而稳定下来来实现。我们确定了两个参数,代表这样的属性,从而表征各种中介是如何混合的。我们还讨论了在KKLT方案的一个变体中的模稳定化和软项,在该变体中,可见扇区Kähler模被反常U(1)规范对称性的D项势稳定化.

英文摘要:

Models with anomalous U(1) gauge symmetry contain various superfields which can have nonzero supersymmetry breaking auxiliary components providing the origin of soft terms in the visible sector, e.g. the U(1) vector superfield, the modulus or dilaton superfield implementing the Green-Schwarz anomaly cancellation mechanism, U(1)-charged but standard model singlet matter superfield required to cancel the Fayet-Iliopoulos term, and finally the supergravity multiplet. We examine the relative strength between these supersymmetry breaking components in a simple class of models, and find that various different mixed mediations of supersymmetry breaking, involving the modulus, gauge, anomaly and D-term mediations, can be realized depending upon the characteristics of D-flat directions and how those D-flat directions are stabilized with a vanishing cosmological constant. We identify two parameters which represent such properties and thus characterize how the various mediations are mixed. We also discuss the moduli stabilization and soft terms in a variant of KKLT scenario, in which the visible sector Kähler modulus is stabilized by the D-term potential of anomalous U(1) gauge symmetry.

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