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arXiv 1502.06980hep-thastro-ph.CO
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大尺度结构的拉格朗日空间一致性关系

Lagrangian space consistency relation for large scale structure

Bart Horn, Lam Hui, Xiao Xiao

摘要:

一致性关系将(N+1)点关联函数的压缩极限与N点函数联系起来,这是一种非微扰对称性陈述,即使相关的高动量模式处于非线性区域和天体物理复杂性中,它也成立。最近,Kehagias & Riotto和Peloso & Pietroni发现了一个适用于大尺度结构的相容关系。我们表明,这可以改写成一个简单的物理声明在拉格朗日空间:压缩关联函数(适当规范化)消失。无论相关观测值是否同时存在,也无论是否存在多流,这都是成立的。这一陈述的简单性表明,在拉格朗日空间中,对非线性区域中的大尺度结构的分析理解可能特别有希望。

英文摘要:

Consistency relations, which relate the squeezed limit of an (N+1)-point correlation function to an N-point function, are non-perturbative symmetry statements that hold even if the associated high momentum modes are deep in the nonlinear regime and astrophysically complex. Recently, Kehagias & Riotto and Peloso & Pietroni discovered a consistency relation applicable to large scale structure. We show that this can be recast into a simple physical statement in Lagrangian space: that the squeezed correlation function (suitably normalized) vanishes. This holds regardless of whether the correlation observables are at the same time or not, and regardless of whether multiple-streaming is present. The simplicity of this statement suggests that an analytic understanding of large scale structure in the nonlinear regime may be particularly promising in Lagrangian space.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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