论文标题
与Planck 2018数据超过$λ$ CDM超过$λ$ CDM的扩展电离
Extended reionization in models beyond $Λ$CDM with Planck 2018 data
论文作者
论文摘要
我们提供了有关扩展电离历史的约束的更新，并使用Planck 2018 Cosmic微波背景各向异性数据进行更新。 Planck 2018大尺度上的数据可改善低多重多数的$ e $ mmode极化电离凹凸的测量，从而提供了改善我们先前结果的可能性。使用对原始聚离子历史的原始聚reion模型进行少量修改，我们发现Planck 2018数据显着改善了我们先前的所有结果：我们发现$τ= 0.0572 _ { - 0.0075}^{+0.0064} $ th in 68％cl的光学深度= 0.0572 _ { - 0.0075}^{+0.0064} $ 68％Cl，in Irivies niste dis dis dis nivion in I. i.efav resif in.forsif inif i.efrav ryshifti。 $ z_ {xe = 0} = 18.18 _ { - 10.89}^{+1.61} $在68％Cl，而恢复持续时间（定义在10％和99％之间的重离）显着降低，即$ $Δ_z^{re-Δ_z^{reion} = 4.59 = 4.59 = 4.59 ___2.45} $ cl。我们探讨了电离历史与宇宙学参数之间的可能相关性，包括$λ$ CDM的重要扩展。 We find that the degeneracy between reionization and scalar spectral index,neutrino mass sum, spatial curvature, dark matter annihilation and other non-standard models are significantly reduced.The reduction of the error bars and the degeneracies, together with the shift towards lower values of the optical depth that we observe in the Poly-reion model are mainly driven by the new low-$\ell$ polarization likelihood of Planck 2018基线基于HFI数据。在没有这种可能性的情况下得出的结果也证实了这一点，并且具有不同替代方法的模型子集的基线替代品。
We provide an update on the constraints on extended reionization histories with the Planck 2018 cosmic microwave background anisotropy data. The Planck 2018 data on large angular scales improve the measurement of the $E$-mode polarization reionization bump at low multipoles providing the possibility to improve our previous results. Using a minor modification to the original Poly-reion model for the reionization history, we find that the Planck 2018 data significantly improve all our previous results: we find as optical depth of $τ=0.0572_{-0.0075}^{+0.0064}$ at 68% CL, that early onsets of reionization are strongly disfavoured, i.e. redshift when the reionization begins, $z_{xe=0}=18.18_{-10.89}^{+1.61}$ at 68% CL,and that reionization duration (defined between 10% and 99% reionization) is significantly reduced, i.e. $Δ_z^{Reion}=4.59_{-2.45}^{+1.67}$ at 68% CL. We explore possible correlations between reionization histories and cosmological parameters, including important extensions beyond $Λ$CDM. We find that the degeneracy between reionization and scalar spectral index,neutrino mass sum, spatial curvature, dark matter annihilation and other non-standard models are significantly reduced.The reduction of the error bars and the degeneracies, together with the shift towards lower values of the optical depth that we observe in the Poly-reion model are mainly driven by the new low-$\ell$ polarization likelihood of Planck 2018 baseline based on the HFI data. This is confirmed also by the results derived without this likelihood and the ones with different alternatives to the baseline that are presented for a subset of models.
