在BICEP 2和BOSS之后修正的宇宙学参数
Revised cosmological parameters after BICEP 2 and BOSS
摘要：
在过去的几十年里，由于宇宙微波背景（CMB）实验所做的越来越精细的测量，\lq标准\rq \，宇宙学模型的参数估计有了显着的改善。普朗克最近的数据与最小的$Λ$ CDM模型吻合得很好。使用普朗克，WMAP和选择的高分辨率实验（highL），张量标量比$r_{0.002}$的似然分析被发现是$<0.11$时，$dn_{s}/d\ln k = 0$。普朗克还使用普朗克+WMAP+highL+BAO可能性对中微子质量$\sum m_ν<0.23\,$ eV施加上限。然而，最近BICEP 2的结果声称从偏振光谱检测到$r= 0.2^{+0.07}_{-0.05}$。此外，SDSS-III BOSS大尺度星系巡天的结果将中微子总质量限制在$\sum m_ν=0.36 \pm 0.10$ eV。研究这些新测量对其他宇宙学参数的影响是很重要的。在本文中，我们评估修订后的约束宇宙学参数的光这两个测量是在一定的张力与普朗克的约束。使用由SDSS-III BOSS和BICEP 2似然测量的$\sum m_ν$上的先验，我们发现具有运行光谱指数（$dn_{s}/d\ln k \neq 0$）的模型导致$A_L>1$在$3.1 σ$处的值。但是，具有$dn_{s}/d\ln k =0$的模型使$A_L$与$1$在$2.1σ$处一致，并且还表明$N_{\rm eff}$与其在$2σ$附近的$3.046$的理论值一致。因此，本文的分析表明，当考虑$\sum m_ν$和$r_{0.05}$的电流极限时，含$dn_{s}/d\ln k =0$的模型与其它宇宙学参数（$N_{\rm eff}$和$A_L$）是一致的。然而，在降低$r_{0.05}$的值时，具有非零$dn_{s}/d\ln k$的模型给出了与$A_L =1$一致的结果[abridged]。
英文摘要：
Estimation of parameters of the \lq standard\rq \,model of cosmology have dramatically improved over past few decades due to increasingly exquisite measurements made by Cosmic Microwave Background (CMB) experiments. Recent data from Planck matches well with the minimal $Λ$CDM model. A likelihood analysis using Planck, WMAP and a selection of high resolution experiments (highL), tensor to scalar ratio $r_{0.002}$ is found to be $<0.11$ when $dn_{s}/d\ln k = 0$. Planck also imposes an upper bound on neutrino mass $\sum m_ν<0.23\,$eV using Planck+WMAP+highL+BAO likelihood. However, recently results from BICEP 2 claims the detection of $r= 0.2^{+0.07}_{-0.05}$ from polarization spectra. Further, results from SDSS-III BOSS large scale galaxy survey constrains the total neutrino mass to $\sum m_ν=0.36 \pm 0.10$ eV. It is important to study the consequences of these new measurements on other cosmological parameters. In this paper we assess the revised constraints on cosmological parameters in light of these two measurements that are in some tension with the constraints from Planck. Using the prior on $\sum m_ν$ as measured by SDSS-III BOSS and BICEP 2 likelihood, we find that the model with running spectral index ($dn_{s}/d\ln k \neq 0$) leads to a value of $A_L>1$ at $3.1 σ$. But, the model with $dn_{s}/d\ln k =0$ makes $A_L$ consistent with $1$, at $2.1σ$ and also shows that $N_{\rm eff}$ is consistent with its theoretical value of $3.046$ at around $2σ$. Therefore, the analysis in this paper shows that the model with $dn_{s}/d\ln k =0$ gives consistency with other cosmological parameters ($N_{\rm eff}$ and $A_L$ ) when the current limits on $\sum m_ν$ and $r_{0.05}$ are considered. However, on reducing the value of $r_{0.05}$, the model with non-zero $dn_{s}/d\ln k$ gives consistent result of $A_L =1$ [abridged].
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