On CMB B-modes and the Onset of Inflation
On CMB B-modes and the Onset of Inflation
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关于 CMB B 模式和通货膨胀的开始
DOI：
10.1088/1475-7516/2019/08/005
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发表时间：
2019
影响因子：
6.4
通讯作者：
Noriaki Kitazawa
中科院分区：
文献类型：
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作者：
熊野俊三;宋勤涛;Noriaki Kitazawa
与Λ清洁发展机制协调模型的预测相比，宇宙微波背景辐射的温度扰动在大角度尺度上似乎受到了系统的抑制。这一行为可能是通胀开始时快速滚动导致的充气减速的一瞥。如果这是真的，原始张量扰动的频谱应该会以相应的方式扭曲，大角度尺度的B模偏振可能会被抑制，这可能是未来像LiteBIRD这样的探测器所能达到的。我们用一种基于截断B模偏振光谱的半解析方法来研究这种情况，在我们看来，这种方法的优点是突出了潜在的物理学。我们提供了一些温和的证据，表明在充分了解再电离过程的情况下，大规模B模的抑制可能是可以实现的。
The temperature perturbations of the cosmic microwave background radiation (CMB) appear systematically suppressed, at large angular scales, with respect to the prediction of the ΛCDM concordance model. This behavior might be a glimpse of the inflaton deceleration from fast-roll at the start of inflation. If this were true, the spectrum of primordial tensor perturbations should be distorted in a corresponding way, with a suppression of large angular scale B-mode polarization that might be within reach for future probes like LiteBIRD. We investigate this scenario by a semi-analytic method based on a truncation of the B-mode polarization spectrum, which in our opinion has the virtue of highlighting the underlying Physics. We present some mild evidence that, with sufficient knowledge of the reionization process, the suppression of large-scale B-modes might be within reach.