The cosmological simulation code $\mathrm{CO}N\mathrm{CEPT}1.0$

Abstract

We present version 1.0 of the cosmological simulation code $\mathrm{CO}N\mathrm{CEPT}$, designed for simulations of large-scale structure formation. $\mathrm{CO}N\mathrm{CEPT}1.0$ contains a P${}^3$M gravity solver, with the short-range part implemented using a novel (sub)tiling strategy, coupled with individual and adaptive particle time-stepping. A primary objective of $\mathrm{CO}N\mathrm{CEPT}$ is ease of use. To this end, it has built-in initial condition generation and can produce output in the form of snapshots, power spectra and direct visualisations. $\mathrm{CO}N\mathrm{CEPT}$ is the first massively parallel cosmological simulation code written in Python. Despite of this, excellent performance is obtained, even comparing favourably to other codes such as $\mathrm{GADGET}$ at similar precision, in the case of low to moderate clustering. By means of power spectrum comparisons we find extraordinary good agreement between $\mathrm{CO}N\mathrm{CEPT}1.0$ and $\mathrm{GADGET}$. At large and intermediate scales the codes agree to well below the per mille level, while the agreement at the smallest scales probed ($k\sim 13h/\mathrm{Mpc}$) is of the order of $1\%$. The $\mathrm{CO}N\mathrm{CEPT}$ code is openly released and comes with a robust installation script as well as thorough documentation.

Matches the published MNRAS version. 27 pages, 13 figures. For the code, see https://github.com/jmd-dk/concept

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