High-resolution CMB bispectrum estimator with flexible modal bases
High-resolution CMB bispectrum estimator with flexible modal bases
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DOI：
10.1103/physrevd.108.063504
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发表时间：
2023-05
影响因子：
5
通讯作者：
Wuhyun Sohn;J. Fergusson;E. Shellard
中科院分区：
文献类型：
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作者：
Wuhyun Sohn;J. Fergusson;E. Shellard
我们提出了一个新的独立管道，用于原始非高斯性的CMB双谱估计，并发布了一个公共代码，用于基于普朗克2018温度和偏振数据约束感兴趣的双谱形状。该估计器结合了传统的KSW和模态估计器的优势，增加了计算复杂性的成本，这已通过密集的算法和实现优化管理。我们还详细介绍了一些方法的进展，在数值积分的tetrapyd域的双谱定义上-通过新的正交规则。该管道已在内部和普朗克进行了验证。作为一个概念验证的例子，我们限制了一些高度振荡的模型，在传统的分析中，使用一个有针对性的基础与固定的振荡频率是遥不可及的，并没有显着的证据，这些形状的原始非高斯性被发现。在这项工作中开发的方法和代码将直接适用于未来的调查，我们期望显着提高灵敏度。
We present a new independent pipeline for the CMB bispectrum estimation of primordial non-Gaussianity and release a public code for constraining bispectrum shapes of interest based on the Planck 2018 temperature and polarization data. The estimator combines the strengths of the conventional KSW and Modal estimators at the cost of increased computational complexity, which has been made manageable through intensive algorithmic and implementation optimization. We also detail some methodological advances in numerical integration over a tetrapyd - domain where the bispectrum is defined on - via new quadrature rules. The pipeline has been validated both internally and against Planck. As a proof-of-concept example, we constrain some highly oscillatory models that were out of reach in conventional analyses using a targeted basis with a fixed oscillation frequency, and no significant evidence for primordial non-Gaussianity of these shapes is found. The methodology and code developed in this work will be directly applicable to future surveys where we expect a notable boost in sensitivity.