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arXiv 1606.00634astro-ph.COgr-qchep-ph
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用扩展参数空间中的$H_0$局部值逼近Planck

Reconciling Planck with the local value of $H_0$ in extended parameter space

Eleonora Di Valentino, Alessandro Melchiorri, Joseph Silk

摘要:

Riess等人最近在2016年确定的哈勃常数的局部值(以下简称R16)现在比普朗克卫星在LCDM模型中提供的最新CMB各向异性数据得出的值高3.3 sigma。在这里,我们执行一个组合的分析普朗克和R16的结果在一个扩展的参数空间,同时改变12个宇宙学参数,而不是通常的6。我们发现了一个幽灵般的暗能量分量,其有效状态方程为$w=-1.29_{-0.12}^{+0.15}$,c.可以解决当前普朗克数据集和R16先验之间的紧张关系,在扩展的$Λ$ CDM场景中。另一方面,中微子有效数与标准预期完全一致。这一结果得到证实时,包括宇宙剪切数据从CFHTLenS调查和CMB透镜约束普朗克。然而,当包括BAO测量时,我们发现与R16的一些张力仍然存在,当我们包括来自JLA目录的Ia型超新星光度距离时也是如此。

英文摘要:

The recent determination of the local value of the Hubble constant by Riess et al, 2016 (hereafter R16) is now 3.3 sigma higher than the value derived from the most recent CMB anisotropy data provided by the Planck satellite in a LCDM model. Here we perform a combined analysis of the Planck and R16 results in an extended parameter space, varying simultaneously 12 cosmological parameters instead of the usual 6. We find that a phantom-like dark energy component, with effective equation of state $w=-1.29_{-0.12}^{+0.15}$ at 68 % c.l. can solve the current tension between the Planck dataset and the R16 prior in an extended $Λ$CDM scenario. On the other hand, the neutrino effective number is fully compatible with standard expectations. This result is confirmed when including cosmic shear data from the CFHTLenS survey and CMB lensing constraints from Planck. However, when BAO measurements are included we find that some of the tension with R16 remains, as also is the case when we include the supernova type Ia luminosity distances from the JLA catalog.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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