Colloquium on Dec. 9, 2021

Supercomputer simulations of dark matter structure formation in the Universe

Speaker: Tomoaki Ishiyama (Chiba University)

Venue: Video Conference

Time: 16:00 PM, Thursday, Dec. 9, 2021

Abstract:

I will introduce the Uchuu suite of large high-resolution cosmological N-body simulations. The largest simulation, named Uchuu, consists of 2.1 trillion dark matter particles in a box of 2.0 Gpc/h. The highest resolution simulation, Shin-Uchuu, consists of 262 billion particles in a box of 140 Mpc/h. Combining these simulations we can follow the evolution of dark matter halos and subhalos spanning those hosting dwarf galaxies to massive galaxy clusters across an unprecedented volume. We present basic statistics, dark matter power spectra, and the halo mass functions, which demonstrate the wide dynamic range and superb statistics of the Uchuu suite. We also provide parameters of a mass-concentration model, which describes the evolution of halo concentration and reproduces our simulation data to within 5% for halos with masses spanning nearly eight orders of magnitude at redshift 0<z<14. We make publicly available various N-body products as part of Uchuu Data Release 1 on the Skies & Universes site.  I will also present a roadmap for Data Release 2, in which galaxies and AGN mock catalogs constructed by various models are provided.

Report PPT:  SWIFAR_Tomoaki Ishiyama.pdf