arXiv 1201.06142012-01-03hep-ph

广义扭曲五维模型的研究

Studies on Generalized Warped Five-Dimensional Models

Joan A. Cabrer

备注：: PhD Thesis, 151 pages, 31 figures, 8 tables

摘要：

在这篇论文中，我们研究了扭曲五维模型的一些方面。我们首先讨论了软墙模型的构造。我们提供了配方，构建这种一致的模型，并解决如何额外的维度的长度可以稳定的问题。我们还讨论了软壁模型中出现的波动谱，并提出了一个具体的模型，其中可以产生一个大的UV/IR层次结构，而无需任何微调。接下来，我们考虑一个双膜的设置，研究如何电弱对称性可以打破扭曲模型与广义度规时，希格斯玻色子在体中传播。我们展示了如何的卡鲁扎-克莱因（KK）规模所产生的电弱精密观测的界限时，希格斯粒子是本地化的红外膜可以减轻。我们将我们的结果应用到SM的最小5D扩展，并考虑AdS几何形状和它的变形受到软墙的启发。我们发现，变形的几何形状大大降低了KK尺度上的界限，到一个点，在那里的KK状态可以在大型强子对撞机的范围内和小层次的问题可以被删除，而不需要引入任何保管对称性。最后，我们研究了所有SM费米子在额外维度中的传播，我们用它来解决SM的味道之谜。我们发现一般明确的表达为斜和非斜电弱观测，以及风味和CP违反运营商。我们将这些结果应用于RS模型和变形几何模型，我们从一组随机的5D汤川耦合进行统计分析。与当前的实验数据的预测的比较表现出在我们的模型相对于RS模型的边界的改善。

英文摘要：

In this thesis we study a number of aspects about warped five-dimensional models. We first discuss on the construction of soft-wall models. We provide recipes for constructing consistent models of this kind and address the issue of how the length of the extra dimension can be stabilized. We also discuss on the spectrum of fluctuations that arise in soft-wall models and we present a concrete model where a large UV/IR hierarchy can be generated without any fine-tuning. Next, we consider a two-brane setup to study how the electroweak symmetry can be broken in warped models with generalized metrics when the Higgs boson propagates in the bulk. We show how the bounds on the Kaluza-Klein (KK) scale that arise from electroweak precision observables can be alleviated when the Higgs is localized towards the infrared brane. We apply our results to a minimal 5D extension of the SM and consider the AdS geometry and a deformation of it inspired by soft-walls. We find that the deformed geometry greatly reduces the bounds on the KK scale, to a point where the KK states can be within the range of the LHC and the little hierarchy problem can be removed without requiring the introduction of any custodial symmetry. Finally, we study the propagation of all SM fermions in the bulk of the extra dimension, which we use to address the flavor puzzle of the SM. We find general explicit expressions for oblique and non-oblique electroweak observables, as well as flavor and CP violating operators. We apply these results to the RS model and the model with deformed geometry, for which we perform a statistical analysis departing from a random set of 5D Yukawa couplings. The comparison of the predictions with the current experimental data exhibits an improvement of the bounds in our model with respect to the RS model.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文