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arXiv 0707.0233hep-thgr-qc
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标量-张量整体宇宙弦的混合紧化

Towards an hybrid compactification with a scalar-tensor global cosmic string

M. C. B. Abdalla, M. E. X. Guimaraes, J. M. Hoff da Silva

摘要:

我们推导出的引力方程的解决方案,导致在六个维度的膜世界的情况下,使用一个全球的宇宙弦解决方案,在低能量有效的弦论框架。最后的时空由一个具有$\mathbb{R}^{(3,1)}\times S^{1}$拓扑和幂律弯曲因子的弯曲膜和一个横截膜的非紧额外维组成。通过查看当前的实验边界,我们发现了一个参数范围,如果膜上维度具有可接受的大小,则它不能解决层次问题。在另一示例中,该问题通过Brans-Dicke参数来平滑。

英文摘要:

We derive a solution of the gravitational equations which leads to a braneworld scenario in six dimensions using a global cosmic string solution in a low energy effective string theory framework. The final spacetime is composed by one warped brane with $\mathbb{R}^{(3,1)}\times S^{1}$ topology and a power law warp factor, and one noncompact extra dimension transverse to the brane. By looking at the current experimental bounds, we find a range of parameters in which, if the on-brane dimension has an acceptable size, it does not solve the hierarchy problem. In another example this problem is smoothed by the Brans-Dicke parameter.

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