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arXiv 0708.0065hep-th
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纯几何厚膜上物质的局部化

Localization of Matters on Pure Geometrical Thick Branes

Yu-Xiao Liu, Xin-Hui Zhang, Li-Da Zhang, Yi-Shi Duan

摘要:

文献中提出了纯几何外尔可积5维时空中的几种类型的厚光滑膜配置。Weyl几何是5维Kaluza-Klein(KK)理论的非黎曼修正。所有这些厚膜解都保持了4维庞加莱不变性,其中一些打破了$Z_2$ --额外维度上的对称性。本文研究了各种物质场在这些纯几何厚膜上的局域化,同时也研究了引力子的局域化。给出了相应的Schr $\mathrm{\ddot{o}}$ dinger问题的势的形状,并得到了最低的KK模.结果表明,对于自旋为0的标量和自旋为1的矢量,存在一个连续的无带隙的$m^2>0$ KK态谱.但只有标量的无质量模在膜上是可正规化的。然而,对于无质量的左或右手征费米子局域化,必须存在某种Yukawa耦合。对于一种特殊的耦合,存在一系列离散的质量KK模式与$m^2 >0$。对于给定的耦合常数,只有一个无质量手征模局域在膜上。

英文摘要:

In the literatures, several types of thick smooth brane configurations in a pure geometric Weyl integrable 5-dimensional space time have been presented. The Weyl geometry is a non-Riemannian modification of 5-dimensional Kaluza--Klein (KK) theory. All these thick brane solutions preserve 4-dimensional Poincaré invariance, and some of them break $Z_2$--symmetry along the extra dimension. In this paper, we study localization of various matter fields on these pure geometrical thick branes, which also localize the graviton. We present the shape of the potential of the corresponding Schr$\mathrm{\ddot{o}}$dinger problem and obtain the lowest KK mode. It is showed that, for both spin 0 scalars and spin 1 vectors, there exists a continuum gapless spectrum of KK states with $m^2>0$. But only the massless mode of scalars is found to be normalizable on the brane. However, for the massless left or right chiral fermion localization, there must be some kind of Yukawa coupling. For a special coupling, there exist a series of discrete massive KK modes with $m^2 >0$. It is also showed that for a given coupling constant only one of the massless chiral modes is localized on the branes.

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。

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