论文标题
重力，中微子物理学和$ H_0 $张力的标量调整理论
Scalar-tensor theories of gravity, neutrino physics, and the $H_0$ tension
论文作者
论文摘要
我们使用$ PLANCK $ 2018数据来约束标量调节理论的最简单模型，其特征在于与$ f（σ）r $的RICCI标量与$ f（σ）= n_ {pl}^2 +ξσ^2 $。我们使用以前的$ planck $和BAO数据发行更新结果，以获取迄今为止在耦合参数上获得最严格的约束，即$ξ<5.5 \ times 10^{ - 4} $ for $ n_ {pl} = 0 $ for $ n_ {pl} = 0 $ πg}）-1 <1.8 \ times 10^{ - 5} $ for $ξ= -1/6 $（共形耦合），均为95％Cl。与$λ$ CDM型号相比，由于放射线平等之后的变化扩展历史记录，所有这些动态模型可容纳$ h_0 $的较高价值，因此可以减轻$ planck $/bao和距离级别的测量，从$4.4σ$的$4.4σ$到$2.3σ$2.3σ$。我们表明，所有这些结果对中微子物理学的变化都是可靠的。与$λ$ CDM型号相比，中微子物理学与与RICCI标量的耦合之间的部分变性允许较小的值$ n _ {\ rm eff} \ sim 2.8 $，$1σ$降低，与标准$ n _ {\ rm eff} = 3.046 $相比，与40％的高度相比，$ n _ $1σ$降低了。
We use $Planck$ 2018 data to constrain the simplest models of scalar-tensor theories characterized by a coupling to the Ricci scalar of the type $F(σ) R$ with $F(σ) = N_{pl}^2 + ξσ^2$. We update our results with previous $Planck$ and BAO data releases obtaining the tightest constraints to date on the coupling parameters, that is $ξ< 5.5 \times 10^{-4}$ for $N_{pl}=0$ (induced gravity or equivalently extended Jordan-Brans-Dicke) and $(N_{pl} \sqrt{8 πG})-1 < 1.8 \times 10^{-5}$ for $ξ= -1/6$ (conformal coupling), both at 95% CL. Because of a modified expansion history after radiation-matter equality compared to the $Λ$CDM model, all these dynamical models accommodate a higher value for $H_0$ and therefore alleviate the tension between $Planck$/BAO and distance-ladder measurement from SNe Ia data from $4.4σ$ at best to $2.3σ$. We show that all these results are robust to changes in the neutrino physics. In comparison to the $Λ$CDM model, partial degeneracies between neutrino physics and the coupling to the Ricci scalar allow for smaller values $N_{\rm eff} \sim 2.8$, $1σ$ lower compared to the standard $N_{\rm eff} = 3.046$, and relax the upper limit on the neutrino mass up to 40%.
