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arXiv 1712.08758astro-ph.CO
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用未来的CMB数据解决普朗克$A_{lens}$张力

Cornering the Planck $A_{lens}$ tension with future CMB data

Fabrizio Renzi, Eleonora Di Valentino, Alessandro Melchiorri

摘要:

普朗克卫星对宇宙微波背景各向异性角功率谱的精确测量表明,在大于$2$标准差的情况下,由参数$A_{lens}$定义的透镜振幅出现异常值。在本文中,讨论了目前的异常状态后,我们量化的潜力,未来的CMB测量确认/伪造的$A_{lens}$张力。我们发现,一个基于空间的实验LiteBIRD可以伪造当前的$A_{lens}$张力在$5$标准差的水平。类似的约束条件可以通过第三阶段实验来实现,假设外部先验的$τ=0.055\pm0.010$的再电离光学深度已经提供了普朗克卫星。阶段IV实验可以进一步测试$10$标准差水平下的$A_{lens}$张力。在不同频率下进行的温度和偏振测量之间的比较可以进一步确定可能的系统学负责$A_{lens}>1$。我们表明,在CMB-S4实验的情况下,极化数据本身将有可能伪造当前的$A_{lens}$异常超过5个标准差,并强烈约束其频率依赖性。我们还评估了未来的限制可能的规模依赖$A_{lens}$。

英文摘要:

The precise measurements of Cosmic Microwave Background Anisotropy angular power spectra made by the Planck satellite show an anomalous value for the lensing amplitude, defined by the parameter $A_{lens}$, at more than $2$ standard deviations. In this paper, after discussing the current status of the anomaly, we quantify the potential of future CMB measurements in confirming/falsifying the $A_{lens}$ tension. We find that a space-based experiment as LiteBIRD could falsify the current $A_{lens}$ tension at the level of $5$ standard deviations. Similar constraints can be achieved by a Stage-III experiment assuming an external prior on the reionization optical depth of $τ=0.055\pm0.010$ as already provided by the Planck satellite. A Stage-IV experiment could further test the $A_{lens}$ tension at the level of $10$ standard deviations. A comparison between temperature and polarization measurements made at different frequencies could further identify possible systematics responsible for $A_{lens}>1$. We show that, in the case of the CMB-S4 experiment, polarization data alone will have the potential of falsifying the current $A_{lens}$ anomaly at more than five standard deviation and to strongly bound its frequency dependence. We also evaluate the future constraints on a possible scale dependence for $A_{lens}$.

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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