Non-linear and non-Gaussian cosmological perturbations
Non-linear and non-Gaussian cosmological perturbations
复制标题
非线性和非高斯宇宙学扰动
DOI：
10.1088/0264-9381/27/12/120301
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发表时间：
2010
影响因子：
3.5
通讯作者：
D. Wands
中科院分区：
文献类型：
--
作者：
M. Sasaki;D. Wands
近年来，人们对宇宙学模型的非线性微扰研究又重新产生了兴趣。这是理论发展和观测进展的结果。新的理论挑战出现在第二和更高的顺序，由于模式耦合和需要开发新的规范不变的变量超过一阶。特别是，非线性相互作用导致偏离高斯分布的原始扰动，即使初始真空波动是完全高斯。这些非高斯性为探索极早期宇宙结构的起源提供了重要的模型。我们现在有一个详细的图片原始分布的物质从宇宙微波背景的调查，特别是美国宇航局的WMAP卫星。根据2009年发射的欧空局普朗克卫星提供的未来数据，情况将继续改善。为了充分利用这些数据，宇宙学家需要将非线性宇宙学微扰理论扩展到线性理论之外，而线性理论在宇宙学尺度上已经足够了。另一个最近的发展是认识到，在高红移星系巡天中发现的大尺度结构也可能对原始曲率扰动的非线性敏感。这一重点部分汇集了一系列邀请论文，探讨了这一主题的几个热点问题。我们希望这将是感兴趣的理论物理学家和天体物理学家都有兴趣在理解和解释宇宙微扰理论和早期宇宙模型的最新发展。当然，这只是一个快速发展的领域的不完整的快照，我们希望读者会受到启发，阅读关于这个主题的进一步工作，也许，填补一些缺失的部分。这一重点部分是专门为纪念列夫考夫曼（1957年？2009），暴胀宇宙学和非高斯扰动的热情先驱。
In recent years there has been a resurgence of interest in the study of non-linear perturbations of cosmological models. This has been the result of both theoretical developments and observational advances. New theoretical challenges arise at second and higher order due to mode coupling and the need to develop new gauge-invariant variables beyond first order. In particular, non-linear interactions lead to deviations from a Gaussian distribution of primordial perturbations even if initial vacuum fluctuations are exactly Gaussian. These non-Gaussianities provide an important probe of models for the origin of structure in the very early universe. We now have a detailed picture of the primordial distribution of matter from surveys of the cosmic microwave background, notably NASA's WMAP satellite. The situation will continue to improve with future data from the ESA Planck satellite launched in 2009. To fully exploit these data cosmologists need to extend non-linear cosmological perturbation theory beyond the linear theory that has previously been sufficient on cosmological scales. Another recent development has been the realization that large-scale structure, revealed in high-redshift galaxy surveys, could also be sensitive to non-linearities in the primordial curvature perturbation. This focus section brings together a collection of invited papers which explore several topical issues in this subject. We hope it will be of interest to theoretical physicists and astrophysicists alike interested in understanding and interpreting recent developments in cosmological perturbation theory and models of the early universe. Of course it is only an incomplete snapshot of a rapidly developing field and we hope the reader will be inspired to read further work on the subject and, perhaps, fill in some of the missing pieces. This focus section is dedicated to the memory of Lev Kofman (1957?2009), an enthusiastic pioneer of inflationary cosmology and non-Gaussian perturbations.