论文标题
根据$ H_0 $张力，对宇宙学的大规模中微子自我互动的更新限制
Updated constraints on massive neutrino self-interactions from cosmology in light of the $H_0$ tension
论文作者
论文摘要
在有效的4-弗米昂相互作用限制下，我们已经更新了由重型标量介导的风味通用中微子自我互动的限制。我们使用松弛时间近似来修改碰撞中微子玻尔兹曼方程，这对于这种特定情况非常准确。根据Planck 2018数据发布的最新CMB数据以及辅助数据，我们确认了具有相对强大的自我相互作用的参数空间中存在区域，这比预期的拟合度更高。但是，我们还发现，最新数据，尤其是Planck 2018版本中的高 - $ \ ell $两极分化数据，即使无法排除该解决方案，也可以分散此解决方案。我们的分析考虑了有限的中微子质量（用$ \ summ_ν$进行参数化），并允许中微子能量密度变化（用$ n _ {\ rm eff} $进行参数化），我们发现在所有情况下，从宇宙学数据中，中微子质量限制了宇宙学数据均可抵抗中性数据的存在，而对中性数据的存在是强有力的。最后，我们还发现，强烈的中微子自我互动不会导致优先选择的$ H_0 $的高价值，即，此模型不是当前$ H_0 $差异的可行解决方案。
We have updated the constraints on flavour universal neutrino self-interactions mediated by a heavy scalar, in the effective 4-fermion interaction limit. We use the relaxation time approximation to modify the collisional neutrino Boltzmann equations, which is known to be very accurate for this particular scenario. Based on the latest CMB data from the Planck 2018 data release as well as auxiliary data we confirm the presence of a region in parameter space with relatively strong self-interactions which provides a better than naively expected fit. However, we also find that the most recent data, in particular high-$\ell$ polarisation data from the Planck 2018 release, disfavours this solution even though it cannot yet be excluded. Our analysis takes into account finite neutrino masses (parameterised in terms of $\sum m_ν$) and allows for a varying neutrino energy density (parameterised in terms of $N_{\rm eff}$), and we find that in all cases the neutrino mass bound inferred from cosmological data is robust against the presence of neutrino self-interactions. Finally, we also find that the strong neutrino self-interactions do not lead to a high value of $H_0$ being preferred, i.e.\ this model is not a viable solution to the current $H_0$ discrepancy.
