Status of Cosmic Microwave Background Observations for the Search of Primordial Gravitational Waves
Status of Cosmic Microwave Background Observations for the Search of Primordial Gravitational Waves
复制标题
寻找原初引力波的宇宙微波背景观测现状
DOI：
10.3390/universe8090489
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发表时间：
2022
期刊：
影响因子：
2.9
通讯作者：
F. Radiconi
中科院分区：
文献类型：
--
作者：
E. Battistelli;V. Capalbo;G. Isopi;F. Radiconi
宇宙微波背景辐射（CMB）是研究宇宙学最有力的工具之一。它的偏振可能留下了引力波暴胀背景的印记，这被认为是在大爆炸后10−38/10−35秒产生的。由于留下在CMB偏振上的信号（如果有的话）的微弱性以及由于需要控制系统效应，检测该背景是极其困难的。此外，天体物理前景的存在，从无卷曲到卷曲状成分的泄漏的可能性，包括引力透镜，以及仪器噪声和系统学，需要灵敏的探测器和智能系统效应控制。我们讨论了在这一领域所做的实验努力，强调了关键的观察差异和选择，这些选择可能会在不久的将来导致检测到宇宙微波背景极化的旋度分量，这是暴胀膨胀的明显迹象。
The cosmic microwave background (CMB) is one of the most powerful tools for cosmology. Its polarization could have imprinted the sign of an inflationary background of gravitational waves, which is supposed to have originated at 10−38/10−35 seconds after the Big Bang. Detecting this background is extremely difficult because of the weakness of the signal (if any) left on the CMB polarization and because of the need to control the systematic effects. Additionally, the presence of astrophysical foregrounds, the possibility of leakage from curl-free to curl-like components, including gravitational lensing, and the instrumental noise and systematics, require sensitive detectors and smart systematic effect control. We discuss the experimental efforts spent in this field, highlighting the key observational difference and the choice that could lead, in the near future, to the detection of the curl component of the CMB polarization, a clear sign of the inflationary expansion.