各向异性额外维度
Anisotropic Extra Dimensions
摘要：
我们考虑的情况下，在一个五维理论，额外的空间维度有不同的缩放比其他四个维度。我们发现背景最大对称的解决方案，当块填充一个宇宙学常数，同时它有一个三膜嵌入其中。这些背景解决方案是令人想起Randall-Sundrum翘曲度规，与体曲率取决于参数的破坏的超态不变性。随后，我们考虑了标量扰动部门的理论，并表明它有一定的病理和显着的功能，在极限中的还原同胚不变性恢复，有鬼标量模式（S）的频谱。
英文摘要：
We consider the scenario where in a five-dimensional theory, the extra spatial dimension has different scaling than the other four dimensions. We find background maximally symmetric solutions, when the bulk is filled with a cosmological constant and at the same time it has a three-brane embedded in it. These background solutions are reminiscent of Randall-Sundrum warped metrics, with bulk curvature depending on the parameters of the breaking of diffeomorphism invariance. Subsequently, we consider the scalar perturbation sector of the theory and show that it has certain pathologies and the striking feature that in the limit where the diffeomorphism invariance is restored, there remain ghost scalar mode(s) in the spectrum.
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