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Then

M. Schmittfull, Z. Vlah, and P. McDonald, “Fast large scale structure perturbation theory using one-dimensional fast Fourier transforms,” Phys. Rev
Original
2016
Later among the works it cites.
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Original
2016
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2020

Cosmological Angular Trispectra and Non-Gaussian Covariance

Lee, Hayden, Dvorkin, Cora

Understand

Angular cosmological correlators are infamously difficult to compute due to the highly oscillatory nature of the projection integrals.

Motivated by recent development on analytic approaches to cosmological perturbation theory, in this paper we present an efficient method for computing cosmological four-point correlations in angular space, generalizing previous works on lower-point functions.
This builds on the FFTLog algorithm that approximates the matter power spectrum as a sum over power-law functions, which makes certain momentum integrals analytically solvable.
The computational complexity is drastically reduced for correlators in a "separable" form---we define a suitable notion of separability for cosmological trispectra, and derive formulas for angular correlators of different separability classes.