论文标题
遗物中微子变性及其对宇宙学参数的影响
Relic Neutrino Degeneracies and Their Impact on Cosmological Parameters
论文作者
论文摘要
在标准的$λ$ CDM模型中，中微子被视为辐射，其质量和可能的退化性忽略了。在本文中，我们计算有限的遗物中微子退化$ξ$对CMB角功率谱的影响，并使用当前的宇宙学数据集在$ξ$上获得约束。我们发现仍然允许$ξ\大约O（1）$。我们还研究了$ξ$，哈勃参数$ h_0 $和频谱索引$ n_s $之间的相关性。由于这些相关性，当$ξ$与其他宇宙学参数一起安装时，通货膨胀模型上的CMB约束会松开，因此，可以恢复有标准配件以95％的置信度排除的一些模型。此外，CMB的张力和$ H_0 $的本地测量值略有缓解。我们的结果表明，$ξ$是用于宇宙学分析的不可忽略的物理参数。
In the standard $Λ$CDM model, neutrinos are treated as radiation, with their masses and possible degeneracy ignored. In this paper, we compute the impact of a finite relic neutrino degeneracy $ξ$ on the CMB angular power spectra, and obtain constraints on $ξ$ using current cosmological data sets. We find that $ξ\approx O(1)$ is still allowed. We also study the correlations between $ξ$, the Hubble parameter $H_0$, and the spectral index $n_s$. Due to these correlations, the CMB constraints on inflation models are loosened when $ξ$ is fitted together with other cosmological parameters, such that some models excluded at 95% confidence level by standard fittings without $ξ$ could be revived. Furthermore, the tension in CMB and local measurements of $H_0$ is slightly alleviated. Our results suggest that $ξ$ is a non-negligible physical parameter for cosmological analyses.
