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arXiv 1507.04684gr-qcastro-ph.CO
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非平坦$Λ$ CDM模型与BOSS新结果的一致性

Consistency of the nonflat $Λ$CDM model with the new result from BOSS

Suresh Kumar

摘要:

利用斯隆数字巡天(SDSS)-III重子振荡光谱巡天(BOSS)数据发布11(DR 11)中的137,562个红移范围$2.1\leq z\leq3.5$类星体,BOSS-SDSS合作估算了宇宙的膨胀速率$H(z=2.34)=222\pm7$ km/s/Mpc,并报告该值与平坦$Λ$ CDM模型在2.5 $σ$水平附近的预测存在矛盾。本文简要介绍了文献中为缓解张力所做的一些尝试,并证明了在具有正曲率的非平坦$Λ$ CDM模型中张力可以自然缓解.我们还通过考虑Planck、WP和BAO数据对非平坦$Λ$ CDM模型的约束条件进行了观测一致性检验。我们发现,非平坦的$Λ$ CDM模型约束与普朗克+WP数据更好地拟合的视线测量$H(z=2.34)=222\pm7$ km/s/Mpc,但只有在仍然有一个穷人适合的BAO横向测量的代价。

英文摘要:

Using 137,562 quasars in the redshift range $2.1\leq z\leq3.5$ from the Data Release 11 (DR11) of the Baryon Oscillation Spectroscopic Survey (BOSS) of Sloan Digital Sky Survey (SDSS)-III, the BOSS-SDSS collaboration estimated the expansion rate $H(z=2.34)=222\pm7$ km/s/Mpc of Universe, and reported that this value is in tension with the predictions of flat $Λ$CDM model at around 2.5$σ$ level. In this paper, we briefly describe some attempts made in the literature to relieve the tension, and show that the tension can naturally be alleviated in non-flat $Λ$CDM model with positive curvature. We also perform the observational consistency check by considering the constraints on the non-flat $Λ$CDM model from Planck,WP and BAO data. We find that the non-flat $Λ$CDM model constrained with Planck+WP data fits better to the line of sight measurement $H(z=2.34)=222\pm7$ km/s/Mpc, but only at the expense of still having a poor fit to the BAO transverse measurements.

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