Testing Inflationary Cosmology with the BICEP1 and BICEP2 Experiments
Testing Inflationary Cosmology with the BICEP1 and BICEP2 Experiments
复制标题
用 BICEP1 和 BICEP2 实验测试暴胀宇宙学
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
R. Aikin
中科院分区：
文献类型：
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作者：
R. Aikin
最近对宇宙微波背景（CMB）温度各向异性的观测支持暴胀范式，其中宇宙的尺度因子在很早的某个时间膨胀了多个数量级。这种情况将产生观测到的宇宙大尺度各向同性和同质性，以及导致观测到的宇宙微波背景（百万分之十）各向异性的尺度不变扰动。暴胀时期也被理论化为产生引力波（或张量扰动）的背景，其影响可以在宇宙微波背景的极化中观察到。由标量扰动产生的 CMB 的 E 模式（或奇偶校验偶数）偏振现在已经得到了非常重要的测量。相比之下，今天由张量扰动引起的 B 模式（或奇偶校验）偏振尚未被观测到。对宇宙微波背景 B 模式偏振的探测将为宇宙历史早期的暴胀时代提供强有力的证据。在这项工作中，我们探索用于探测 CMB B 模式偏振的实验技术和分析方法。这些实验技术已被用来建造 Bicep2 望远镜，该望远镜于 2009 年部署到南极。经过三年的观测，Bicep2 获得了迄今为止对 CMB 度尺度偏振最深入的观测之一。同样，这项工作描述了为 Bicep1 三年数据分析开发的分析方法，其中包括 Bicep1 获取的完整数据集。该分析对 CMB 的 B 模式偏振产生了迄今为止最严格的约束，对应于 r = 0.04±0.32 的张量标量比估计，或 r 的贝叶斯 95% 可信区间
Recent observations of the temperature anisotropies of the cosmic microwave background (CMB) favor an inflationary paradigm in which the scale factor of the universe inflated by many orders of magnitude at some very early time. Such a scenario would produce the observed large-scale isotropy and homogeneity of the universe, as well as the scale-invariant perturbations responsible for the observed (10 parts per million) anisotropies in the CMB. An inflationary epoch is also theorized to produce a background of gravitational waves (or tensor perturbations), the effects of which can be observed in the polarization of the CMB. The E-mode (or parity even) polarization of the CMB, which is produced by scalar perturbations, has now been measured with high significance. Con- trastingly, today the B-mode (or parity odd) polarization, which is sourced by tensor perturbations, has yet to be observed. A detection of the B-mode polarization of the CMB would provide strong evidence for an inflationary epoch early in the universe’s history. In this work, we explore experimental techniques and analysis methods used to probe the B- mode polarization of the CMB. These experimental techniques have been used to build the Bicep2 telescope, which was deployed to the South Pole in 2009. After three years of observations, Bicep2 has acquired one of the deepest observations of the degree-scale polarization of the CMB to date. Similarly, this work describes analysis methods developed for the Bicep1 three-year data analysis, which includes the full data set acquired by Bicep1. This analysis has produced the tightest constraint on the B-mode polarization of the CMB to date, corresponding to a tensor-to-scalar ratio estimate of r = 0.04±0.32, or a Bayesian 95% credible interval of r
用 BICEP 观测宇宙微波背景偏振
DOI：
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发表时间：
2008
期刊：
American Astronomical Society Meeting Abstracts #211
影响因子：
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作者：
Chiang Cynthia
通讯作者：
Chiang Cynthia