Page 1 of 1

FFTLog-and-beyond: Generalized FFTLog algorithm

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


Bibcode: 2019ascl.soft11022F

Preferred citation method:

ID: ascl:1911.022