Randall-Sundrum scenario with an extra warped dimension
Randall-Sundrum scenario with an extra warped dimension
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DOI：
10.1103/physrevd.64.064003
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发表时间：
2001-03
影响因子：
5
通讯作者：
H. Collins;B. Holdom
中科院分区：
文献类型：
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作者：
H. Collins;B. Holdom
我们研究了一个场景，其中两个四膜嵌入六个维度。当度规在与膜平行的一个维度上是周期性和紧凑的时，其余五个维度的有效宇宙学常数的值可以采用各种值，这取决于度规对第六维的依赖。出现的图像类似于兰德尔-桑德鲁姆模型，但有一个额外的扭曲维度，允许满足通常的薄膜-整体微调，而不需要微调潜在的六维理论中的任何参数。尽管作用量包含度规的四个导数的项，但我们表明，当膜具有有限的自然厚度时，这些项对Randall-Sundrum结构只有很小的影响。这四个导数项的存在也允许形成一种类似于磁区壁所产生的构型，但这种构型仅由重力产生。
We investigate a scenario with two four-branes embedded in six dimensions. When the metric is periodic and compact in one of the dimensions parallel to the branes, the value of the effective cosmological constant for the remaining five dimensions can assume a variety of values, determined by the dependence of the metric on the sixth dimension. The picture that emerges resembles the Randall-Sundrum model but with an extra warped dimension that allows the usual brane-bulk fine tuning to be satisfied without finely tuning any of the parameters in the underlying six dimensional theory. Although the action contains terms with four derivatives of the metric, we show that when the branes have a finite, natural thickness, such terms have only a small effect on the Randall-Sundrum structure. The presence of these four derivative terms also allows a configuration that resembles that produced by a domain wall but which results from gravity alone.