FAST-PT

FAST-PT is a code to calculate quantities in cosmological perturbation theory at 1-loop (including, e.g., corrections to the matter power spectrum). The code utilizes Fourier methods combined with analytic expressions to reduce the computation time to scale as N log N, where N is the number of grid points in the input linear power spectrum.

Easy installation with pip:

• pip install fast-pt
• Note: use --no-deps if you use a conda python distribution, or just use conda installation

Easy installation with conda:

• conda install fast-pt

Full installation with examples:

• Make sure you have current version of numpy, scipy, and matplotlib
• download the latest FAST-PT release (or clone the repo)
• install the repo: python -m pip install .
• run the most recent example: cd examples && python3 hello_fastpt.py
• hopefully you get a plot!
• for a more in-depth example of new features: cd examples && python3 v4_example.py
• for older examples see the 'examples' folder

Our papers (JCAP 2016, 9, 15; arXiv:1603.04826) and (JCAP 2017, 2, 30; arXiv:1609.05978) describe the FAST-PT algorithm and implementation. Please cite these papers when using FAST-PT in your research. For the intrinsic alignment implementation, cite PRD 100, 103506 (arXiv:1708.09247).

FAST-PT is under continued development and should be considered research in progress. FAST-PT is open source and distributed with the MIT license. If you have comments, questions, or feedback, please file an issue.