arXiv 2202.093102022-02astro-ph.COhep-ph

宇宙学中大质量中微子与光介质的自相互作用

Massive neutrino self-interactions with a light mediator in cosmology

Jorge Venzor, Gabriela Garcia-Arroyo, Abdel Pérez-Lorenzana, Josue De-Santiago

备注：: Matches published version, improved discussion
DOI：: 10.1103/PhysRevD.105.123539

摘要：

非标准的自相互作用可以改变宇宙学中微子的演化，主要是通过阻尼自由流，这应该会在宇宙学观测中留下痕迹。虽然总的效应与中微子质量和更大的$N_{\rm eff}$产生的效应相反，但它们不能被后者完全抵消。我们利用宇宙学数据，包括普朗克2018年的宇宙微波背景，BAO测量，本地$H_0$，Ly- $α$和SNIa，以约束大质量中微子与非常轻的标量介质的自相互作用。我们发现，在95% C. L.，仅普朗克2018年数据应为$g_{\rm eff}< 1.94 \times 10^{-7}$，考虑普朗克+ BAO时应为$1.97\times10^{-7}$。对于$H_0$（$H_0$ +SNe+Ly- $α$）数据，该结合松弛至$2.27\times 10^{-7}$（$2.3\times 10^{-7}$）。使用Planck + BAO数据集，$H_0$张力从4.3 $σ$（对于$Λ$ CDM）降低到3.2 $σ$。Akaike信息准则由于Plank或Planck + BAO数据的较大参数空间而惩罚自相互作用模型，但当我们使用局部$H_0$测量时，有利于相互作用模型。当我们包括整个数据池时，$H_0$的值更大一些是首选的，它伴随着更大的$N_{\rm eff}$值和更严格的$Σm_ν$边界。

英文摘要：

Nonstandard self-interactions can alter the evolution of cosmological neutrinos, mainly by damping free streaming, which should leave traces in cosmological observables. Although overall effects are opposite to those produced by neutrino mass and a larger $N_{\rm eff}$, they cannot be totally canceled by these last. We harness cosmological data that includes Cosmic Microwave Background from Plank 2018, BAO measurements, local $H_0$, Ly-$α$ and SNIa, to constrain massive neutrino self-interactions with a very light scalar mediator. We find that the effective coupling constant, at the 95\% C.L., should be $g_{\rm eff}< 1.94 \times 10^{-7}$ for only Planck 2018 data and $1.97\times10^{-7}$ when Planck + BAO are considered. This bound relaxes to $2.27\times 10^{-7}$ ($2.3\times 10^{-7}$) for $H_0$ ($H_0$+SNe+Ly-$α$) data. Using the Planck + BAO dataset, the $H_0$ tension lowers from 4.3$σ$ (for $Λ$CDM) to 3.2$σ$. The Akaike Information Criterion penalizes the self-interacting model due to its larger parameter space for Plank or Planck + BAO data, but favors the interacting model when we use local $H_0$ measurements. A somewhat larger value for $H_0$ is preferred when we include the whole data pool, which comes accompanied with a larger value of $N_{\rm eff}$ and a more constricted bound on $Σm_ν$.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

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