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arXiv 2102.13618astro-ph.COhep-ph
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中微子质量与红移的关系

Reconstruction of the neutrino mass as a function of redshift

Christiane S. Lorenz, Lena Funcke, Matthias Löffler, Erminia Calabrese

摘要:

我们重建中微子质量的函数红移,z,从目前的宇宙学数据使用标准的装箱先验和线性样条先验变量结。利用宇宙微波背景温度、极化和透镜效应数据,结合重子声振荡和超新星的距离测量,我们发现中微子质量符合$\sum m_ν(z)$ = const.我们得到了一个较大的中微子质量的束缚,在低红移处,$\sum m_ν(z = 0)$ < 1.46 eV(95%CL),与暗能量支配的开始相一致.这一结果可以用众所周知的低红移下$\sum m_ν$和$Ω_Λ$之间的简并性来解释,也可以用中微子质量在宇宙中很晚才产生的模型来解释。最后,我们将我们的结果转换为非相对论中微子衰变模型的宇宙学极限,发现$\sum m_ν$ < 0.21 eV(95% CL),这将是卡特琳实验无法达到的。

英文摘要:

We reconstruct the neutrino mass as a function of redshift, z, from current cosmological data using both standard binned priors and linear spline priors with variable knots. Using cosmic microwave background temperature, polarization and lensing data, in combination with distance measurements from baryonic acoustic oscillations and supernovae, we find that the neutrino mass is consistent with $\sum m_ν(z)$ = const. We obtain a larger bound on the neutrino mass at low redshifts coinciding with the onset of dark energy domination, $\sum m_ν(z = 0)$ < 1.46 eV (95% CL). This result can be explained either by the well-known degeneracy between $\sum m_ν$ and $Ω_Λ$ at low redshifts, or by models in which neutrino masses are generated very late in the Universe. We finally convert our results into cosmological limits for models with non-relativistic neutrino decay and find $\sum m_ν$ < 0.21 eV (95% CL), which would be out of reach for the KATRIN experiment.

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