论文标题
Atacama宇宙学望远镜：宇宙学测量中中微子自我相互作用的持久性
The Atacama Cosmology Telescope: The Persistence of Neutrino Self-Interaction in Cosmological Measurements
论文作者
论文摘要
我们使用来自Atacama宇宙学望远镜（ACT）DR4的数据来寻找在宇宙微波背景下中微子自我相互作用的存在。与先前的作品一致，我们发现的后验分布是双峰的，一种模式与$λ$ cdm一致，而中微子强烈自我相互作用。通过将ACT数据与来自WMAP的大规模信息相结合，我们发现，由中微子的自我交流显着延迟的中微子免费流媒体发作与这些数据兼容，这些数据在$2-3σ$级别上兼容。如前所述，随着Planck数据的包含，偏好转移到$λ$ CDM。我们确定对强中微子自我相互作用的偏好在很大程度上是由$ 700 \ sillesim \ elly \ ell \ lyssim 1000 $ 1000 $驱动的。预计该区域将是区分中微子自我相互作用模式的关键，并将很快使用更敏感的数据进行探测。
We use data from the Atacama Cosmology Telescope (ACT) DR4 to search for the presence of neutrino self-interaction in the cosmic microwave background. Consistent with prior works, the posterior distributions we find are bimodal, with one mode consistent with $Λ$CDM and one where neutrinos strongly self-interact. By combining ACT data with large-scale information from WMAP, we find that a delayed onset of neutrino free streaming caused by significantly strong neutrino self-interaction is compatible with these data at the $2-3σ$ level. As seen in the past, the preference shifts to $Λ$CDM with the inclusion of Planck data. We determine that the preference for strong neutrino self-interaction is largely driven by angular scales corresponding to $700 \lesssim \ell \lesssim 1000$ in the ACT E-mode polarization data. This region is expected to be key to discriminate between neutrino self-interacting modes and will soon be probed with more sensitive data.
