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arXiv 1105.4185hep-th
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D-膜上的全息漫步

Holographic Walking Technicolor from D-branes

Lilia Anguelova, Peter Suranyi, L. C. Rohana Wijewardhana

摘要:

我们通过对偶引力描述研究了一个动力学电弱对称破缺模型。引力对偶是通过将一对D 7-反D 7膜嵌入到IIB型背景中而得到的,IIB型背景与行走规范理论是对偶的。我们进一步发展了以前的研究这个模型。特别是,我们表明,有一个非平凡的关系,需要满足轴向矢量模式存在。此外,我们明确地计算电弱S参数。这个结果是正定的,而且正如所料,比早期的类QCD D膜结构要小得多。我们还发现在这个模型中的矢量和轴矢量介子的质量和衰变常数。这使我们能够通过对离散状态的贡献求和来获得S的另一个估计。值得注意的是,与以前的全息研究相反,前几个最低态的总和确实给出了一个非常好的近似完整的答案。

英文摘要:

We investigate a model of dynamical electroweak symmetry breaking via a dual gravitational description. The gravity dual is obtained by embedding a D7 - anti-D7 pair of branes into a type IIB background that is dual to a walking gauge theory. We develop further a previous study of this model. In particular, we show that there is a nontrivial relation that needs to be satisfied in order for axial-vector modes to exist. Furthermore, we compute explicitly the electroweak S parameter. The result is positive-definite and, as was to be expected, much smaller than in earlier QCD-like D-brane constructions. We also find the masses and decay constants of the vector and axial-vector mesons in this model. This allows us to obtain another estimate for S by summing the contributions of the discrete states. It is noteworthy that, in contrast to previous holographic studies, the sum of the first several lowest-lying states does give a very good approximation to the full answer.

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