FAST-PT calculates 1-loop corrections to the matter power spectrum in cosmology. The code utilizes Fourier methods combined with analytic expressions to reduce the computation time down to scale as N log N, where N is the number of grid point in the input linear power spectrum. FAST-PT is extremely fast, enabling mode-coupling integral computations fast enough to embed in Monte Carlo Markov Chain parameter estimation.
For use in research, cite https://ui.adsabs.harvard.edu/abs/2016JCAP...09..015M and https://ui.adsabs.harvard.edu/abs/2017JCAP...02..030F ; for intrinsic alignment implementation, cite https://ui.adsabs.harvard.edu/abs/2019PhRvD.100j3506B