High-resolution CMB bispectrum estimator with flexible modal basis

• DOI: 10.48550/arxiv.2305.14646
• Publication Date: 2023-01-01
• Authors: Wuhyun Sohn; J. Fergusson; E. P. S. Shellard
• Keywords: Basis (linear algebra)

We present a new independent pipeline for the CMB bispectrum estimation of primordial non-Gaussianity and release public code constraining shapes interest based on Planck 2018 temperature polarization data. The estimator combines strengths conventional KSW Modal estimators at cost increased computational complexity, which has been made manageable through intensive algorithmic implementation optimization. also detail some methodological advances in numerical integration over tetrapyd - domain where is defined via quadrature rules. validated both internally against Planck. As proof-of-concept example, we constrain highly oscillatory models that were out reach analyses using targeted basis with fixed oscillation frequency, no significant evidence these found. methodology developed this work will be directly applicable to future surveys expect notable boost sensitivity.