= Mass-concentration relation of dark-matter haloes
The \b[mass-concentration relation of dark-matter haloes] describes a statistical trend of <halo concentration> with mass and epoch. The original <Navarro--Frenk--White profile> simulations connected denser inner structure with earlier assembly, helping explain why smaller halos were typically more concentrated in those hierarchical models. The relation has scatter and depends on the cosmology and halo definition; it is not a unique concentration fixed by mass alone.<A Universal Density Profile from Hierarchical Clustering by Julio F. Navarro and others>[Abstract: mass-dependent characteristic density, collapse redshift and assembly history]{ref}
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