Uchuu simulations

Uchuu is a two trillion N-body simulation that uses Planck2015 cosmology. It was produced with the GreeM N-body code (Ishiyama et al. 2009, Ishiyama et al. 2012) at the ATERUI II supercomputer in Japan. Another two boxes were run with the same resolution but different volumes (Uchuu400, Uchuu100); and a third one with high resolution (shinUchuu). More details are given in the Uchuu DR1 paper Ishiyama et al. 2020.

Uchuu
Box : 2000 Mpc/h
Particles: 12,800**3
Mp : 3.27e8 Msun/h
Soften. : 4.27 kpc/h
z_init : 127 (2LPT)
50 snapshots

cosmological parameters
Planck2015 (table 4, rightmost column)
Ω_m = 0.3089 Ω_L = 0.6911 h = 0.6774
σ_8 = 0.8159 Ω_b = 0.0486 ns = 0.9667
Linear Power Spectrum

Uchuu400
Box : 400 Mpc/h
Particles : 2560**3
Mp : 3.27e8 Msun/h
Soften. : 4.27 kpc/h
z_init : 127 (2LPT)
50 snapshots
Uchuu100
Box : 100 Mpc/h
Particles : 640**3
Mp : 3.27e8 Msun/h
Soften. : 4.27 kpc/h
z_init : 127 (2LPT)
50 snapshots
shinUchuu
Box : 140 Mpc/h
Particles : 6400**3
Mp : 8.97e5 Msun/h
Soften. : 0.4 kpc/h
z_init : 127 (2LPT)
50 snapshots
"Uchuu" is a Japanese word meaning "Universe"
Uchuu12-1