Time-sliced perturbation theory for large scale structure I: general formalism
Time-sliced perturbation theory for large scale structure I: general formalism
复制标题
大尺度结构的时间切片微扰理论I：一般形式主义
DOI：
10.1088/1475-7516/2016/07/052
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发表时间：
2015
影响因子：
6.4
通讯作者：
S. Sibiryakov
中科院分区：
文献类型：
--
作者：
D. Blas;M. Garny;M. Ivanov;S. Sibiryakov
我们提出了一种新的分析方法来描述大尺度结构的形成在温和的非线性制度。该方法的中心目标是在给定时刻产生宇宙学观测量的时间依赖概率分布函数。扩展高斯权重周围的分布函数，我们制定了一个微扰技术来计算非线性校正宇宙学的量子场论，类似于在三维欧几里得量子场论的图形扩展，与时间扮演的外部参数的作用。对于爱因斯坦-德西特宇宙中冷暗物质的物理相关情况，可以精确地找到分布函数的时间演化，并通过控制微扰膨胀的依赖于时间的耦合常数来封装。我们表明，所有的积木的膨胀是免费的虚假红外增强的贡献，困扰标准的宇宙学微扰理论。这就为系统地再现大尺度结构形成中的红外效应铺平了道路。我们还认为，这里提出的方法提供了一个自然的框架，以占短尺度动态的影响，大尺度沿着有效场论的路线。
We present a new analytic approach to describe large scale structure formation in the mildly non-linear regime. The central object of the method is the time-dependent probability distribution function generating correlators of the cosmological observables at a given moment of time. Expanding the distribution function around the Gaussian weight we formulate a perturbative technique to calculate non-linear corrections to cosmological correlators, similar to the diagrammatic expansion in a three-dimensional Euclidean quantum field theory, with time playing the role of an external parameter. For the physically relevant case of cold dark matter in an Einstein-de Sitter universe, the time evolution of the distribution function can be found exactly and is encapsulated by a time-dependent coupling constant controlling the perturbative expansion. We show that all building blocks of the expansion are free from spurious infrared enhanced contributions that plague the standard cosmological perturbation theory. This paves the way towards the systematic resummation of infrared effects in large scale structure formation. We also argue that the approach proposed here provides a natural framework to account for the influence of short-scale dynamics on larger scales along the lines of effective field theory.
影响因子：
6.5
作者：
Ade, P. A. R.;Aghanim, N.;Zonca, A.
通讯作者：
Zonca, A.
影响因子：
6.4
作者：
M. Pietroni
通讯作者：
M. Pietroni