非对称膜引力中的鬼现象与退耦隐身极限
Ghosts in asymmetric brane gravity and the decoupled stealth limit
摘要：
本文研究了具有诱导曲率的5维非对称膜世界模型中真空de Sitter膜周围引力扰动的谱。这概括了Charmousis，Gregory和Padilla（CGP）提出的隐形加速模型，该模型实现了Cardassian宇宙学，其中幂律宇宙加速可以由普通物质驱动。与CGP分析的Minkowski膜的情况相反，当体块的体积为无穷大时，我们发现在de Sitter膜上总是有一个微扰鬼波传播。我们讨论了这个鬼的隐形加速模型的含义，并确定了一个极限情况下，鬼的deSitter曲率消失。
英文摘要：
We study the spectrum of gravitational perturbations around a vacuum de Sitter brane in a 5D asymmetric braneworld model, with induced curvature on the brane. This generalises the stealth acceleration model proposed by Charmousis, Gregory and Padilla (CGP) which realises the Cardassian cosmology in which power law cosmic acceleration can be driven by ordinary matter. Whenever the bulk has infinite volume we find that there is always a perturbative ghost propagating on the de Sitter brane, in contrast to the Minkowski brane case analysed by CGP. We discuss the implication of this ghost for the stealth acceleration model, and identify a limiting case where the ghost decouples as the de Sitter curvature vanishes.
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