FFTLog-and-beyond: Generalized FFTLog algorithm

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Ada Coda
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FFTLog-and-beyond: Generalized FFTLog algorithm

Post by Ada Coda » Wed Dec 04, 2019 10:53 pm

FFTLog-and-beyond: Generalized FFTLog algorithm

Abstract: FFTLog-and-beyond takes the FFTLog algorithm for single-Bessel integrals and generalizes it for integrals containing a derivative of the Bessel function to solve the non-Limber integrals. The full non-Limber angular power spectrum integral is simplified by noting the small contribution from unequal-time nonlinear terms; this significantly reduces the computation and avoids the double-Bessel integral. The original FFTLog algorithm is also extended to compute integrals containing derivatives of Bessel functions, which can be used to efficiently compute angular power spectra including redshift-space distortions (RSD) and Doppler effects. C and Python versions of the code are available.

Credit: Fang, Xiao

Site: https://github.com/xfangcosmo/FFTLog-and-beyond

Bibcode: 2019ascl.soft11022F

Preferred citation method: https://ui.adsabs.harvard.edu/abs/2019arXiv191111947F

ID: ascl:1911.022

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