Breaking the degeneracy between polarization efficiency and cosmological parameters in CMB experiments
Breaking the degeneracy between polarization efficiency and cosmological parameters in CMB experiments
复制标题
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
影响因子:
5
通讯作者:
Hivon, Eric
中科院分区:
文献类型:
--
作者:
Galli, Silvia;Wu, W. L. Kimmy;Benabed, Karim;Bouchet, François;Crawford, Thomas M.;Hivon, Eric
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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DOI:
--
发表时间:
2018
期刊:
Astronomical Telescopes + Instrumentation
影响因子:
--
作者:
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DOI:
10.1088/1475-7516/2020/12/045
发表时间:
2020-12-01
影响因子:
6.4
作者:
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通讯作者:
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DOI:
10.1117/12.2231912
发表时间:
2016
期刊:
Astronomy Letters
影响因子:
--
作者:
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影响因子:
4.8
作者:
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DOI:
10.48550/arxiv.1907.08284
发表时间:
2019
期刊:
Bulletin of the American Astronomical Society
影响因子:
--
作者:
Lee Adrian
通讯作者:
Lee Adrian