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arXiv 1003.2214astro-ph.COhep-th
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21厘米辐射与活动源CMB的相关

Correlations between 21 cm Radiation and the CMB from Active Sources

Aaron Berndsen, Levon Pogosian, Mark Wyman

摘要:

中性氢无处不在,在宇宙历史的大部分时间里吸收和发射21厘米辐射。活跃的扰动源,如宇宙弦,会在中性氢的分布和复合产生的宇宙微波背景(CMB)辐射中同时产生扰动。移动的弦会产生尾流,导致21厘米的亮度波动,同时也会通过戈特-凯泽-斯特宾斯效应扰乱CMB光。这将导致21 cm和CMB各向异性之间的空间相关性。被动源,如暴胀扰动,在再电离开始之前没有预测交叉相关。因此,观测到宇宙微波背景辐射和黑暗时代21厘米辐射之间的任何交叉相关性,都将构成新物理学的证据。我们计算了宇宙弦引起的CMB和21 cm的关联,并评估了它们的可观测性。

英文摘要:

Neutral hydrogen is ubiquitous, absorbing and emitting 21 cm radiation throughout much of the Universe's history. Active sources of perturbations, such as cosmic strings, would generate simultaneous perturbations in the distribution of neutral hydrogen and in the Cosmic Microwave Background (CMB) radiation from recombination. Moving strings would create wakes leading to 21 cm brightness fluctuations, while also perturbing CMB light via the Gott-Kaiser-Stebbins effect. This would lead to spatial correlations between the 21 cm and CMB anisotropies. Passive sources, like inflationary perturbations, predict no cross correlations prior to the onset of reionization. Thus, observation of any cross correlation between CMB and 21 cm radiation from dark ages would constitute evidence for new physics. We calculate the cosmic string induced correlations between CMB and 21 cm and evaluate their observability.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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