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arXiv 1407.8486hep-thastro-ph.CO
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关于封闭宇宙中绝热模和沃德恒等式的注记

Note on Adiabatic Modes and Ward Identities In A Closed Universe

Xiao Xiao

摘要:

作为宇宙学关联函数软极限的陈述,相容性关系在任何平坦的FRW宇宙中都存在。在这封信中,我们探讨了在空间封闭的宇宙中找到这种关系的可能性,其中软极限$\textbf{q}\rightarrow 0$在任何严格意义上都不存在。尽管没有空间无限的空间切片,我们发现绝热模式及其相关的一致性关系的玩具宇宙与背景拓扑$R\times S^2$。通过取大半径极限$R\gg \mathcal{H}^{-1}$,我们生活在一个小的哈勃大小的局部补丁的球体上恢复平坦的FRW宇宙绝热模式。结果表明,无论是膨胀和平移绝热模式在当地补丁恢复的全球膨胀的球体上,在不同的地方。

英文摘要:

As statements regarding the soft limit of cosmological correlation functions, consistency relations are known to exist in any flat FRW universe. In this letter we explore the possibility of finding such relations in a spatially closed universe, where the soft limit $\textbf{q}\rightarrow 0$ does not exist in any rigorous sense. Despite the absence of spatial infinity of the spatial slices, we find the adiabatic modes and their associated consistency relations in a toy universe with background topology $R\times S^2$. Flat FRW universe adiabatic modes are recovered via taking the large radius limit $R\gg \mathcal{H}^{-1}$, for which we are living in a small local patch of Hubble size on the sphere. It is shown that both dilation and translation adiabatic modes in the local patch are recovered by a global dilation on the sphere, acting at different places.

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