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arXiv 2008.01785astro-ph.CO
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解构普朗克TT功率谱以抑制对$Λ$ CDM的偏差

Deconstructing the Planck TT Power Spectrum to Constrain Deviations from $Λ$CDM

Joshua A. Kable, Graeme E. Addison, Charles L. Bennett

摘要:

$Λ$ CDM预测与当前宇宙学数据集的一致性检查可能会阐明解决宇宙学张力所需的变化类型。为此,我们修改类玻尔兹曼代码创建唯象振幅,类似于透镜振幅参数$A_L$,萨克斯-沃尔夫,多普勒,早期集成萨克斯-沃尔夫(eISW),和偏振贡献的CMB温度各向异性,然后我们包括这些额外的振幅适合普朗克TT功率谱。我们发现,允许这些幅度之一,以改变在同一时间的结果在很小的改善,在$Λ$ CDM单独表明,这些物理效应中的每一个被正确地考虑到目前的精度水平。此外,我们发现,唯一的一对现象振幅,结果在一个显着的改善,以适应普朗克温度数据的结果从不同的萨克斯-沃尔夫和多普勒效应的振幅同时。然而,我们表明,这个模型实际上只是细化$Λ$ CDM + $A_L$解决方案。我们测试添加我们的唯象振幅以及$N_{\textrm{eff}}$,$Y_{\textrm{He}}$,和$n_{\textrm{run}}$到$Λ$ CDM + $A_L$,发现这些模型扩展没有提供显着的改善$Λ$ CDM + $A_L$时,拟合普朗克温度数据。最后,我们量化的贡献eISW效应和透镜的物理物质密度从普朗克温度数据的约束,允许从每个效果的唯象幅度变化。我们发现,这些影响发挥了相对较小的作用(不确定性分别增加了$3.5\%$和$16\%$),这表明整体光子包络具有最大的约束力。

英文摘要:

Consistency checks of $Λ$CDM predictions with current cosmological data sets may illuminate the types of changes needed to resolve cosmological tensions. To this end, we modify the CLASS Boltzmann code to create phenomenological amplitudes, similar to the lensing amplitude parameter $A_L$, for the Sachs-Wolfe, Doppler, early Integrated Sachs-Wolfe (eISW), and Polarization contributions to the CMB temperature anisotropy, and then we include these additional amplitudes in fits to the Planck TT power spectrum. We find that allowing one of these amplitudes to vary at a time results in little improvement over $Λ$CDM alone suggesting that each of these physical effects are being correctly accounted for given the current level of precision. Further, we find that the only pair of phenomenological amplitudes that results in a significant improvement to the fit to Planck temperature data results from varying the amplitudes of the Sachs-Wolfe and Doppler effects simultaneously. However, we show that this model is really just refinding the $Λ$CDM + $A_L$ solution. We test adding our phenomenological amplitudes as well as $N_{\textrm{eff}}$, $Y_{\textrm{He}}$, and $n_{\textrm{run}}$ to $Λ$CDM + $A_L$ and find that none of these model extensions provide significant improvement over $Λ$CDM + $A_L$ when fitting Planck temperature data. Finally, we quantify the contributions of both the eISW effect and lensing on the constraint of the physical matter density from Planck temperature data by allowing the phenomenological amplitude from each effect to vary. We find that these effects play a relatively small role (the uncertainty increases by $3.5\%$ and $16\%$ respectively) suggesting that the overall photon envelope has the greatest constraining power.

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