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arXiv 1704.04784astro-ph.COgr-qchep-phhep-th
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对暴胀的限制的重新审视:包括哈勃常数的最新本地测量的分析

Constraints on inflation revisited: An analysis including the latest local measurement of the Hubble constant

Rui-Yun Guo, Xin Zhang

摘要:

我们通过使用当前的宇宙学观测,包括最新的本地测量的哈勃常数($H_{0} = 73.00\pm 1.75$ km s $^{-1}$ Mpc $^{-1}$)的通货膨胀模型的约束。我们用普朗克2015 CMB全数据、BICEP 2和Keck阵列CMB B模数据、BAO数据和$H_0$的直接测量数据约束标量和张量扰动的原始功率谱。为了缓解哈勃常数的局部测定与其它天体物理观测之间的紧张关系,我们考虑了宇宙学模型中的附加参数$N_{\rm eff}$。我们发现,对于$Λ$ CDM+ $r$ + $N_{\rm eff}$模型,尺度不变性仅在3.3 $σ$水平上被排除,而$ΔN_{\rm eff}>0$在1.6 $σ$水平上更受青睐。将所得到的$(n_s,r)$的1 $σ$和2 $σ$等值线与选定的暴胀模型的理论预测进行比较,我们发现凸势和凹势在2 $σ$水平上都是有利的,自然暴胀模型在2 $σ$水平以上被排除,Starobinsky $R^2$暴胀模型只在2 $σ$水平附近有利,自发破缺的超对称暴胀模型是目前最受欢迎的模型。

英文摘要:

We revisit the constraints on inflation models by using the current cosmological observations involving the latest local measurement of the Hubble constant ($H_{0} = 73.00\pm 1.75$ km s $^{-1}$ Mpc$^{-1}$). We constrain the primordial power spectra of both scalar and tensor perturbations with the observational data including the Planck 2015 CMB full data, the BICEP2 and Keck Array CMB B-mode data, the BAO data, and the direct measurement of $H_0$. In order to relieve the tension between the local determination of the Hubble constant and the other astrophysical observations, we consider the additional parameter $N_{\rm eff}$ in the cosmological model. We find that, for the $Λ$CDM+$r$+$N_{\rm eff}$ model, the scale invariance is only excluded at the 3.3$σ$ level, and $ΔN_{\rm eff}>0$ is favored at the 1.6$σ$ level. Comparing the obtained 1$σ$ and 2$σ$ contours of $(n_s,r)$ with the theoretical predictions of selected inflation models, we find that both the convex and concave potentials are favored at 2$σ$ level, the natural inflation model is excluded at more than 2$σ$ level, the Starobinsky $R^2$ inflation model is only favored at around 2$σ$ level, and the spontaneously broken SUSY inflation model is now the most favored model.

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