Simulated forecasts for primordial B -mode searches in ground-based experiments
Simulated forecasts for primordial B -mode searches in ground-based experiments
复制标题
地面实验中原始 B 模式搜索的模拟预测
DOI：
10.1103/physrevd.95.043504
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发表时间：
2017
影响因子：
5
通讯作者：
Alonso D
中科院分区：
文献类型：
--
作者：
Alonso D
探测暴胀引力波对宇宙微波背景辐射（CMB）模式偏振的影响是当前和下一代CMB实验的主要科学案例之一。在这项工作中，我们将探讨一些地面设施将不得不面对的挑战，以进行这种测量中存在的银河前景和相关的大气噪声。我们目前的预测阶段3（S3）和计划阶段4（S4）的实验模拟天空地图的分析的基础上，使用基于地图的贝叶斯前景清理方法。因此，我们的研究结果一致传播前景参数，如空间变化的光谱指数，以及测量的张量标量比上的偏差所造成的前景不正确的建模的不确定性。我们发现，S3和S4类实验应该能够把约束的顺序和分别，假设仪器系统的影响是在控制之下。我们进一步研究了基准前景模型的偏差，发现虽然第二偏振尘埃成分对S3和S4的影响很小，但2%的偏振异常尘埃排放成分将通过第4阶段实验清楚地检测到。
Detecting the imprint of inflationary gravitational waves on the-mode polarization of the cosmic microwave background (CMB) is one of the main science cases for current and next-generation CMB experiments. In this work we explore some of the challenges that ground-based facilities will have to face in order to carry out this measurement in the presence of galactic foregrounds and correlated atmospheric noise. We present forecasts for stage-3 (S3) and planned stage-4 (S4) experiments based on the analysis of simulated sky maps using a map-based Bayesian foreground-cleaning method. Our results thus consistently propagate the uncertainties on foreground parameters such as spatially varying spectral indices, as well as the bias on the measured tensor-to-scalar ratiocaused by an incorrect modeling of the foregrounds. We find that S3 and S4-like experiments should be able to put constraints onof the orderandrespectively, assuming instrumental systematic effects are under control. We further study deviations from the fiducial foreground model, finding that, while the effects of a second polarized dust component would be minimal on both S3 and S4, a 2% polarized anomalous dust emission component would be clearly detectable by stage-4 experiments.