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Fast Power Spectrum Estimation | Ue-Li Pen
; | Date: |
29 Apr 2003 | Journal: | Mon.Not.Roy.Astron.Soc. 346 (2003) 619 | Subject: | astro-ph | Abstract: | We present a new algorithm to rapidly and optimally compute power spectra. This new algorithm is based on a generalization of iterative multigrid, and has computational cost O(N log N), compared to the standard brute force approach which costs O(N^3). The procedure retains this speed on the full sky and for ill-conditioned matrices. It is applicable to galaxy power spectra, CMB, polarization and weak lensing data. We present a mathematical convergence analysis, and performance results. | Source: | arXiv, astro-ph/0304513 | Services: | Forum | Review | PDF | Favorites |
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