Anisotropic Inflation and Cosmological Observations
Anisotropic Inflation and Cosmological Observations
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各向异性暴胀和宇宙学观测
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
R. Emami
中科院分区：
文献类型：
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作者：
R. Emami
最近的观测为暴胀模型的建立打开了一扇新的窗口。正如WMAP数据首次报道的那样，CMB图上可能存在一些统计各向异性的迹象，尽管这些发现的统计意义正在争论中。受这些观察的启发，人们开始考虑可能导致统计各向异性的新的暴胀模型。构造各向异性膨胀的最简单的方法是引入向量场。在本论文中，我们研究了各向异性暴胀的模型及其观测意义，如功率谱、双谱等。首先，我们建立了一个新的模型，它包含了一个在保持规范不变性的同时打破共形不变性的规范场。我们表明，在这类模型中，可以有一个吸引子阶段的系统的演化时，规范场的反反应成为重要的暴胀子场的演化。然后我们研究了这类模型中的宇宙学微扰理论。更具体地说，我们计算各向异性校正由于矢量场的存在。然后，我们将分离宇宙形式主义推广到我们的各向异性设置，并将其用于各向异性膨胀的一些具体例子。最后，我们连接的原始各向异性的具体例子和CMB的意见。我们在带电标量场模型中计算了TT、TE、TB、EB和BB关联，并在CMB映射上寻找各向异性暴胀的唯一特征。任何未来检测这些统计各向异性将排除各向同性FRW模型。
Recent observations opened up a new window on the inflationary model building. As it was firstly reported by the WMAP data, there may be some indications of statistical anisotropy on the CMB map, although the statistical significance of these findings are under debate. Motivated by these observations, people begun considering new inflationary models which may lead to statistical anisotropy. The simplest possible way to construct anisotropic inflation is to introduce vector fields. During the course of this thesis, we study models of anisotropic inflation and their observational implications such as power spectrum, bispectrum etc. Firstly we build a new model, which contains the gauge field which breaks the conformal invariance while preserving the gauge invariance. We show that in these kind of models, there can be an attractor phase in the evolution of the system when the back-reaction of the gauge field becomes important in the evolution of the inflaton field. We then study the cosmological perturbation theory in these kind of models. More specifically, we calculate the anisotropic corrections due to the presence of the vector field. We then generalize the separate universe formalism to our anisotropic set up and use it in some specific examples of anisotropic inflation. Finally, we connect the primordial anisotropies to the specific examples and to CMB observations. We calculate the TT, TE, TB, EB and BB correlation in the model of charged scalar field model and look for the unique signatures that the anisotropic inflation can have on the CMB map. Any future detection of these statistical anisotropies would rule out the isotropic FRW models.
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.