Breaking the degeneracy between polarization efficiency and cosmological parameters in CMB experiments

Breaking the degeneracy between polarization efficiency and cosmological parameters in CMB experiments
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打破CMB实验中偏振效率与宇宙学参数之间的简并性

DOI:
10.1103/physrevd.104.023518
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发表时间:
2021
期刊:
影响因子:
5
通讯作者:
Hivon, Eric
Hivon, Eric
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Galli, Silvia;Wu, W. L. Kimmy;Benabed, Karim;Bouchet, François;Crawford, Thomas M.;Hivon, Eric

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利用宇宙微波背景(CMB)的偏振数据进行精确的宇宙学参数估计对地图校准提出了严格的要求,正如普朗克卫星最近的结果所强调的那样。本文指出,通过温度-E模互功率谱(TE)和E模自功率谱(EE)的联合拟合,可以实现与模型相关的偏振定标。这为使用其他方法确定的带平均偏振效率测量提供了有价值的交叉检查。我们证明,在,TE和EE的组合约束偏振校准与次百分之不确定性与普朗克数据和2%的不确定性与sptpoldata。当我们把引力透镜的振幅、相对论性粒子的数量或中微子质量的总和都考虑进去时,我们也得到了类似的结论。当边缘化偏振校准时,宇宙学参数的不确定性受到的影响最小,除了可以预期的原始标量功率谱幅度的不确定性,其增加了20- 50%。然而,该信息可以通过添加温度自功率谱(TT)信息来完全恢复。对于当前和未来的地面实验,SPT-3G和CMB-S4,我们预测宇宙学参数的不确定性将最小限度地降低时,边缘化的偏振校准参数。此外,CMB-S4还可以通过结合TE和EE将其极化校准限制在的水平上,并且还可以通过包括TT来达到。因此,我们得出结论,依赖于校准againstPlanck极化图,其统计不确定性是有限的,将不足以为即将到来的实验。
Accurate cosmological parameter estimates using polarization data of the cosmic microwave background (CMB) put stringent requirements on map calibration, as highlighted in the recent results from thePlancksatellite. In this paper, we point out that a model-dependent determination of polarization calibration can be achieved by the joint fit of the temperature-E-mode cross-power spectrum (TE) and E-mode auto-power spectrum (EE). This provides a valuable cross-check to band-averaged polarization efficiency measurements determined using other approaches. We demonstrate that, in, the combination of the TE and EE constrain polarization calibration with sub-percent uncertainty withPlanckdata and 2% uncertainty withsptpoldata. We arrive at similar conclusions when extendingto include the amplitude of lensing, the number of relativistic species, or the sum of the neutrino masses. The uncertainties on cosmological parameters are minimally impacted when marginalizing over polarization calibration, except, as can be expected, for the uncertainty on the amplitude of the primordial scalar power spectrum, which increases by 20–50%. However, this information can be fully recovered by adding temperature auto-power spectrum (TT) information. For current and future ground-based experiments, SPT-3G and CMB-S4, we forecast the cosmological parameter uncertainties to be minimally degraded when marginalizing over polarization calibration parameters. In addition, CMB-S4 could constrain its polarization calibration at the level ofby combining TE and EE, and reachby also including TT. We therefore conclude that relying on calibrating againstPlanckpolarization maps, whose statistical uncertainty is limited to, would be insufficient for upcoming experiments.
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