论文标题
用宇宙微波背景的各向异性约束原始张量特征
Constraining primordial tensor features with the anisotropies of the Cosmic Microwave Background
论文作者
论文摘要
通常认为，宇宙学量表上重力波的随机背景遵循几乎尺度独立的功率谱，正如通货膨胀范式所预测的那样。但是，频谱可能具有强烈的尺度依赖性特征，例如通过膨胀过程中观众轴测磁场的瞬时动力学，并不是难以想象的。使用\ textit {planck}和二头肌/凯克数据集中的温度和极化图，我们搜索了此类特征，以CMB尺度的原始张量频谱中的对数正态凸起的示例。我们目前还没有发现任何证据表明存在类似凸起的张量特征，但是证明未来的CMB实验（例如Litebird和CMB-S4）将大大改善我们确定这种颠簸的幅度，位置和宽度的前景。我们还强调了删除在角度尺度上限制这些功能$ \ ell \ gtrsim 100 $的作用。
It is commonly assumed that the stochastic background of gravitational waves on cosmological scales follows an almost scale-independent power spectrum, as generically predicted by the inflationary paradigm. However, it is not inconceivable that the spectrum could have strongly scale-dependent features, generated, e.g., via transient dynamics of spectator axion-gauge fields during inflation. Using the temperature and polarisation maps from the \textit{Planck} and BICEP/Keck datasets, we search for such features, taking the example of a log-normal bump in the primordial tensor spectrum at CMB scales. We do not find any evidence for the existence of bump-like tensor features at present, but demonstrate that future CMB experiments such as LiteBIRD and CMB-S4 will greatly improve our prospects of determining the amplitude, location and width of such a bump. We also highlight the role of delensing in constraining these features at angular scales $\ell\gtrsim 100$.
