CON CEPT documentation

Release1.0.1
GitHubhttps://github.com/jmd-dk/concept/ 
AuthorJeppe Dakin, Aarhus University dakin@phys.au.dk
DateApril 08, 2024

This is the documentation for CONCEPT, the COsmological N-body CodE in PyThon

Introduction

CONCEPT is a free and open-source simulation code for cosmological structure formation. The code should run on any Linux system, from massively parallel computer clusters to laptops. The code is written almost exclusively in Python, but achieves C-like performance through code transformation using a custom transpiler/optimizer and Cython. While highly competitive regarding both performance and accuracy, CONCEPT further strives for ease of use.

CONCEPT is capable of simulating matter particles evolving under self-gravity in an expanding background. It has multiple gravitational solvers to choose from, and has adaptive time integration built in. In addition to particles, the code is further able to evolve fluids at various levels of non-linearity, providing the means for the inclusion of more exotic species such as massive neutrinos, as well as for simulations consistent with general relativistic perturbation theory. Various non-standard species — such as decaying cold dark matter — are fully supported.

CONCEPT comes with a sophisticated initial condition generator built in, and can output snapshots, power spectra, bispectra and several kinds of renders.

The CLASS code is fully integrated into CONCEPT, supplying the needed information for e.g. initial condition generation and general relativistic corrections.

Contents

Below you will find the global table of contents for the documentation. If you’re new to CONCEPT, start with the tutorial, which briefly covers installation before taking you on a guided tour through the CONCEPT universe.