A fast and accurate algorithm for spherical harmonic analysis on HEALPix grids with applications to the cosmic microwave background radiation
A fast and accurate algorithm for spherical harmonic analysis on HEALPix grids with applications to the cosmic microwave background radiation
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HEALPix 网格上快速准确的球谐分析算法及其在宇宙微波背景辐射中的应用
DOI:
10.1016/j.jcp.2020.109544
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发表时间:
2020
影响因子:
4.1
通讯作者:
Wright, Grady B.
中科院分区:
文献类型:
--
作者:
Drake, Kathryn P.;Wright, Grady B.
Abstract The Hierarchical Equal Area isoLatitude Pixelation (HEALPix) scheme is used extensively in astrophysics for data collection and analysis on the sphere. The scheme was originally designed for studying the Cosmic Microwave Background (CMB) radiation, which represents the first light to travel during the early stages of the universe's development and gives the strongest evidence for the Big Bang theory to date. Refined analysis of the CMB angular power spectrum can lead to revolutionary developments in understanding the nature of dark matter and dark energy. In this paper, we present a new method for performing spherical harmonic analysis for HEALPix data, which is a central component to computing and analyzing the angular power spectrum of the massive CMB data sets. The method uses a novel combination of a non-uniform fast Fourier transform, the double Fourier sphere method, and Slevinsky's fast spherical harmonic transform [38]. For a HEALPix grid with N pixels (points), the computational complexity of the method is O (N log 2 N), with an initial set-up cost of O (N 3/2 log N). This compares favorably with O (N 3/2) runtime complexity of the current methods available in the HEALPix software when multiple maps need to be analyzed at the same time. Using numerical experiments, we demonstrate that the new method also appears to provide better accuracy over the entire angular power spectrum of synthetic data when compared to the current methods, with a convergence rate at least two times higher.
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影响因子:
2.5
作者:
R. Slevinsky
通讯作者:
R. Slevinsky
影响因子:
8.7
作者:
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者:
Wright, E. L.
影响因子:
1.8
作者:
I. Jovanovic;M. Heffner;L. Rosenberg;N. Bowden;A. Bernstein;D. Carter;M. Foxe;M. Hotz;M. Howe;A. Myers;C. Winant
通讯作者:
C. Winant
DOI:
--
发表时间:
2012
期刊:
影响因子:
--
作者:
Richard S. Miller;G. Nerurkar;D. Lawrence
通讯作者:
D. Lawrence
DOI:
--
发表时间:
2008
期刊:
IEEE International Conference on Robotics and Automation
影响因子:
--
作者:
R. Hoover;A. A. Maciejewski;R. Roberts
通讯作者:
R. Roberts