Precise measurements of inflationary features with 21 cm observations
Precise measurements of inflationary features with 21 cm observations
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通过 21 厘米观测值精确测量膨胀特征
DOI：
10.1103/physrevd.94.123518
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发表时间：
2016-07
影响因子：
5
通讯作者：
Xuelei Chen
中科院分区：
文献类型：
--
作者：
Yidong Xu;Jan Hamann;Xuelei Chen
未来利用HI强度图对21~cm辐射的观测将使我们能够在合理的观测时间内在非常大的观测体积上探测宇宙的大尺度结构。我们证明，此类调查中包含的三维信息将成为寻找暴胀期间原始功率谱和双谱中留下的特征的极其强大的工具。在这里，我们专注于“共振”和“阶跃”暴胀模型，并预测即将到来的21厘米实验的潜力，以检测这些暴胀的功能，在可观察的功率和双谱。我们发现，全尺寸天籁实验和平方公里阵列（SKA）有可能提高几个数量级的灵敏度，目前的宇宙微波背景（CMB）实验。
Future observations of 21~cm emission using HI intensity mapping will enable us to probe the large scale structure of the Universe over very large survey volumes within a reasonable observation time. We demonstrate that the three-dimensional information contained in such surveys will be an extremely powerful tool in searching for features that were imprinted in the primordial power spectrum and bispectrum during inflation. Here we focus on the "resonant" and "step" inflation models, and forecast the potential of upcoming 21~cm experiments to detect these inflationary features in the observable power- and bispectrum. We find that the full scale Tianlai experiment and the Square Kilometre Array (SKA) have the potential to improve on the sensitivity of current Cosmic Microwave Background (CMB) experiments by several orders of magnitude.