论文标题
Planck和SPTPOL数据的结合分析有利于早期的暗能量模型
Combined analysis of Planck and SPTPol data favors the early dark energy models
论文作者
论文摘要
我们研究了Planck温度功率谱在低多物，$ \ ell <1000 $和SPTPOL数据的含义。我们表明，这种组合可以预测$λ$ CDM宇宙学内的镜头诱导的声峰平滑的一致性，并得出了宇宙学参数的强大预测。 Combining only the Planck large-scale temperature data and the SPTPol polarization and lensing measurements within $Λ$CDM model we found substantially lower values of linear matter density perturbation $σ_8$ which bring the late-time parameter $S_8=σ_8\sqrt{Ω_m/0.3}=0.763\pm0.022$ into accordance with galaxy clustering and weak镜头测量。它还提高了哈勃常数$ h_0 = 69.68 \ pm1.00 {\ rm \，\，\，km \，s^{ - 1} mpc^{ - 1}} $，从而将哈勃张力降低到$2.5σ$级别。我们检查了早期黑暗能量（EDE）模型中的残留张力，该模型在重组之前产生了简短的能量注入。我们实现了标量场的背景和扰动演变，潜在缩放为$ v（ϕ）\ propto ϕ^{2n} $。包括宇宙剪切测量值（儿童，Viking-450，DES）和局部距离磁通数据（SH0ES），我们发现EDE完全减轻了Hubble的张力，同时又不将拟合度降低到大型结构数据。与Coostance $λ$ CDM型号相比，EDE场景显着提高了$2.9σ$。该中间雷德希夫数据（超新星数据集和巴属声学振荡数据）的帐户非常符合我们的参数预测，并指示EDE比$λ$ CDM的偏好在$3σ$中。
We study the implications of the Planck temperature power spectrum at low multipoles, $\ell<1000$, and SPTPol data. We show that this combination predicts consistent lensing-induced smoothing of acoustic peaks within $Λ$CDM cosmology and yields the robust predictions of the cosmological parameters. Combining only the Planck large-scale temperature data and the SPTPol polarization and lensing measurements within $Λ$CDM model we found substantially lower values of linear matter density perturbation $σ_8$ which bring the late-time parameter $S_8=σ_8\sqrt{Ω_m/0.3}=0.763\pm0.022$ into accordance with galaxy clustering and weak lensing measurements. It also raises up the Hubble constant $H_0=69.68\pm1.00{\rm \,\,km\,s^{-1}Mpc^{-1}}$ that reduces the Hubble tension to the $2.5σ$ level. We examine the residual tension in the Early Dark Energy (EDE) model which produces the brief energy injection prior to recombination. We implement both the background and perturbation evolutions of the scalar field which potential scales as $V(ϕ)\propto ϕ^{2n}$. Including cosmic shear measurements (KiDS, VIKING-450, DES) and local distance-ladder data (SH0ES) to the combined fit we found that EDE completely alleviates the Hubble tension while not degradating the fit to large-scale structure data. The EDE scenario significantly improves the goodness-of-fit by $2.9σ$ in comparison with the concordance $Λ$CDM model. The account for the intermediate-redshift data (the supernova dataset and baryon acoustic oscillation data) fits perfectly to our parameter predictions and indicates the preference of EDE over $Λ$CDM at $3σ$.
