论文标题
宇宙学中的轻中微子自我互动
Massive neutrino self-interactions with a light mediator in cosmology
论文作者
论文摘要
非标准的自我互动可以改变宇宙中微子的演变，主要是通过抑制自由流媒体，这应该留在宇宙学可观察的情况下。尽管总体效果与中微子质量和较大$ n _ {\ rm eff} $产生的效果相反，但最后一次无法完全取消它们。我们利用宇宙学数据，其中包括木板2018的宇宙微波背景，BAO测量值，本地$ H_0 $，LY- $α$和SNIA，以用非常轻的标量调解器来限制大规模的中微子自我互动。我们发现，在95 \％c.l.处的有效耦合常数应为$ g _ {\ rm eff} <1.94 \ times 10^{ - 7} $，仅适用于Planck 2018数据，$ 1.97 \ times10^{ - 7} $何时考虑planck + bao。对于$ H_0 $（$ H_0 $+sne+sne+se+ly- $α$），这将放松至$ 2.27 \ times 10^{ - 7} $（$ 2.3 \ times 10^{ - 7} $）数据。使用Planck + BAO数据集，$ H_0 $张力从4.3 $σ$（对于$λ$ CDM）降至3.2 $σ$。 Akaike信息标准由于其较大的木板或planck + Bao数据的参数空间而惩罚了自相互作用模型，但是当我们使用本地$ H_0 $测量值时，偏爱交互模型。当我们包含整个数据池时，首选$ H_0 $的值较大，而整个数据池伴随着$ n _ {\ rm eff} $的较大值，并且在$σm_ν$上更加限制。
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 $Σm_ν$.
