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arXiv 1702.06509astro-ph.CO
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联合CMB和HST数据是否支持尺度不变谱?

Do joint CMB and HST data support a scale invariant spectrum?

Micol Benetti, Leila L. Graef, Jailson S. Alcaniz

摘要:

我们结合当前的测量本地膨胀率,$H_0$,大爆炸核合成(BBN)的氦丰度的估计与最新的宇宙微波背景(CMB)的数据从普朗克合作讨论的尺度不变的哈里森-Zeldovch-Peebles(HZP)光谱的观测可行性。我们还分析了它的一些扩展,即HZP + $Y_P$和HZP + $N_{eff}$,其中$Y_P$是原始氦的质量分数和$N_{eff}$是相对论自由度的有效数。我们进行了贝叶斯分析,并表明,后者的模型是有利的$N_{eff}$躺在区间$3.70 \pm 0.13$($1σ$),这是目前允许的一些独立的分析的值的标准宇宙学。

英文摘要:

We combine current measurements of the local expansion rate, $H_0$, and Big Bang Nucleosynthesis (BBN) estimates of helium abundance with the latest cosmic microwave background (CMB) data from the Planck Collaboration to discuss the observational viability of the scale invariant Harrison-Zeldovch-Peebles (HZP) spectrum. We also analyze some of its extensions, namely, HZP + $Y_P$ and HZP + $N_{eff}$, where $Y_P$ is the primordial helium mass fraction and $N_{eff}$ is the effective number of relativistic degrees of freedom. We perform a Bayesian analysis and show that the latter model is favored with respect to the standard cosmology for values of $N_{eff}$ lying in the interval $3.70 \pm 0.13$ ($1σ$), which is currently allowed by some independent analyses.

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