Signature of primordial non-Gaussianity on the 21?cm power spectrum from dark ages
Signature of primordial non-Gaussianity on the 21?cm power spectrum from dark ages
复制标题
黑暗时代 21?cm 功率谱上的原始非高斯性特征
DOI：
10.1093/ptep/ptac095
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发表时间：
2022
影响因子：
3.5
通讯作者：
Yamauchi Daisuke
中科院分区：
文献类型：
--
作者：
Minoda Teppei;Saga Shohei;Takahashi Tomo;Tashiro Hiroyuki;Yamauchi Daisuke;Yokoyama Shuichiro;Yoshiura Shintaro;Yamauchi Daisuke
我们研究了黑暗时期21 cm线差亮温功率谱上的原始非高斯性特征。采用引力聚类的微扰处理，定量估计了非高斯和单环修正对21 cm功率谱的影响。基于Fisher矩阵分析，研究了21cm功率谱对局域原始非高斯性约束的潜在影响。我们的研究结果表明，对于基线为几十公里的阵列，21 cm功率谱可以将原始非高斯性约束到比宇宙微波背景测量更严格的水平，并且其约束能力比21 cm双谱更强，而在最终情况下，21 cm双谱最终变得更强。
We study the signature of primordial non-Gaussianity imprinted on the power spectrum of the 21 cm line differential brightness temperature during dark ages. Employing the perturbative treatment of gravitational clustering, we quantitatively estimate the effects of the non-Gaussian and one-loop corrections on the 21 cm power spectrum. The potential impact of the use of the 21 cm power spectrum for the constraint on local-type primordial non-Gaussianity is investigated based on the Fisher matrix analysis. Our results show that the 21 cm power spectrum for an array with a baseline of several tens of kilometers can constrain the primordial non-Gaussianity to a level severer than that from cosmic microwave background measurements, and its constraining power is stronger than that of the 21 cm bispectrum, while in the ultimate situation the 21 cm bispectrum eventually becomes more powerful.