论文标题
转弯(准)与宇宙学退化中微子
Cornering (quasi) degenerate neutrinos with cosmology
论文作者
论文摘要
鉴于宇宙学观察的敏感性的提高,我们研究了准脱位中微子质量场景的状态。在具有大量中微子的标准宇宙学模型的最简单扩展中,我们发现准脱位中微子受到当前宇宙学数据和中微子振荡实验的严格限制。 %%我们发现Planck 2018对宇宙微波背景(CMB)各向异性的观察结果是$ 2.4 $ GHUSSIAN $σ$ $ 2.4,同时增加了Baryon声学振荡(BAO)的数据将其拒绝至5.9 $σ$。如果中微子质量的总和为$σm_ν= 60 $ \ meV(中微子振荡实验允许的最小值),则能够排除准排除的最高统计显着性将出现出现。实际上,从未来的宇宙学探针的结合中预期的,15 MeV的灵敏度将进一步提高排斥水平,最高为17 $σ$。 %我们讨论了这些预测在基础宇宙学模型上的假设方面的鲁棒性,还将它们与$β$衰减端点和中准leds双β衰减研究的界限进行了比较。
In light of the improved sensitivities of cosmological observations, we examine the status of quasi-degenerate neutrino mass scenarios. Within the simplest extension of the standard cosmological model with massive neutrinos, we find that quasi-degenerate neutrinos are severely constrained by present cosmological data and neutrino oscillation experiments. % % We find that Planck 2018 observations of cosmic microwave background (CMB) anisotropies disfavour quasi-degenerate neutrino masses at $2.4$ Gaussian $σ$'s, while adding Baryon acoustic oscillations (BAO) data brings the rejection to 5.9$σ$'s. % The highest statistical significance with which one would be able to rule out quasi-degeneracy would arise if the sum of neutrino masses is $Σm_ν= 60$ \meV (the minimum allowed by neutrino oscillation experiments); % indeed a sensitivity of 15 meV, as expected from a combination of future cosmological probes, would further improve the rejection level up to 17$σ$. % We discuss the robustness of these projections with respect to assumptions on the underlying cosmological model, and also compare them with bounds from $β$ decay endpoint and neutrinoless double beta decay studies.