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arXiv 2205.04773gr-qchep-thmath-phmath.MP
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de Sitterization via Kerr-Schild

de Sitterization via Kerr-Schild

Aditya Sharma, Kinjal Banerjee, Jishnu Bhattacharyya

摘要:

空间均匀的宇宙时空,在存在正的宇宙学常数和满足某些合理能量条件的物质的情况下演化,通常渐近地(至少局部地)接近德西特几何。在这项工作中,我们提出了一种替代方法来描述这种现象。我们专注于这样的模型的一个子集承认广义克尔-Schild表示。我们认为,定义这样一个表示的函数可以选择,这样,他们的渐近行为,使演化到德西特时空通过表示表现。我们验证了我们的要求Kantowski-Sachs家庭的宇宙时空。

英文摘要:

Spatially homogeneous cosmological spacetimes, evolving in the presence of a positive cosmological constant and matter satisfying some reasonable energy conditions, typically approach the de Sitter geometry asymptotically (at least locally). In this work, we propose an alternate way to characterize this phenomena. We focus on a subset of such models admitting a generalized Kerr-Schild representation. We argue that the functions which define such a representation can be chosen, such that, their asymptotic behavior make the evolution towards the de Sitter spacetime manifest through the representation. We verify our claim for the Kantowski-Sachs family of cosmological spacetimes.

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