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 (mini-Uchuu, micro-Uchuu); and a third one with high resolution (Shin-Uchuu). More details are given in the Uchuu DR1 paper Ishiyama et al. 2020. "Uchuu" is a Japanese word meaning "Universe".

Uchuu simulations were perfomed at the ATERUI II supercomputer in Japan, and made use of the skun6@IAA facility in Spain. DR1 products are publicly available in Skies & Universes via the skun@IAA server, with support of RedIRIS, and the Uchuu-Cloud@CESGA in Spain.

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
z_init = 127 (2LPT)

Simulation Name	Box [Mpc/h]	Npart	M_part [M_sun/h]	Soft. [Kpc/h]	Snaps	Halos	Trees	DM	Lensing
Uchuu	2000	12,800**3	3.27e8	4.27	list1	sí	sí	sí
mini-Uchuu	400	2560**3	3.27e8	4.27	list2	sí	sí	sí
micro-Uchuu	100	640**3	3.27e8	4.27	list3	sí	sí	sí
Shin-Uchuu	140	6400**3	8.97e5	0.40	list4