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

The cosmological simulation code $\scriptstyle{\rm CO}N{\rm CEPT}\, 1.0$