膜世界各向同性与磁场
Braneworld Isotropization and Magnetic Fields
摘要：
我们考虑一个磁性的Bianchi I膜世界，它嵌入在两个Schwarzschild-AdS时空之间，在相反的方向上推进等量，并将它们与四维广义相对论中的类似解进行比较。各向异性在膜上的有效耗散被明确地证明，我们称之为膜世界各向同性化的过程。从整体的观点来看，我们把这归因于离开膜的热引力子携带的各向异性能量。从膜的观点来看，这可以用对偶CFT中粒子的产生来解释。我们解释如何使我们能够更好地了解各向异性膜的行为已经在文献中研究。我们还展示了如何有粒子被过度生产的证据，并评论如何这可能最终提供一个可能的观测签名膜世界。
英文摘要：
We consider a magnetic Bianchi I braneworld, embedded in between two Schwarzschild-AdS spacetimes, boosted equal amounts in opposite directions and compare them to the analagous solution in four-dimensional General Relativity. The efficient dissipation of anisotropy on the brane is explicitly demonstrated, a process we dub braneworld isotropization. From the bulk point of view, we attribute this to anisotropic energy being carried into the bulk by hot gravitons leaving the brane. From the brane point of view this can be interpreted in terms of the production of particles in the dual CFT. We explain how this result enables us to gain a better understanding of the behaviour of anisotropic branes already studied in the literature. We also show how there is evidence of particles being over-produced, and comment on how this may ultimately provide a possible observational signature of braneworlds.
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