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UNIT project: Universe $N$-body simulations for the Investigation of Theoretical models from galaxy surveys | | Chia-Hsun Chuang
; Gustavo Yepes
; Francisco-Shu Kitaura
; Marcos Pellejero-Ibanez
; Sergio Rodriguez-Torres
; Yu Feng
; R. Benton Metcalf
; Risa H. Wechsler
; Cheng Zhao
; Chun-Hao To
; Shadab Alam
; Arka Banerjee
; Joseph DeRose
; Carlo Giocoli
; Alexander Knebe
; Guillermo Reyes
; | | Date: |
6 Nov 2018 | | Abstract: | We present the UNIT $N$-body cosmological simulations project, which is
designed to provide precise predictions for nonlinear statistics of the galaxy
distribution appropriate for characterizing emission line and luminous red
galaxies in the current and upcoming generation of galaxy surveys. We
investigate the recently suggested technique of Angulo & Pontzen 2016 designed
to suppress the variance of cosmological simulations with a suite of precise
particle mesh simulations (FastPM) as well as with full $N$-body calculations
with a mass resolution of $sim 1.2 imes10^9,h^{-1}$M$_{odot}$. We study
redshift space distortions, cosmic voids, higher order statistics from $z=2$
down to $z=0$. We find that both two- and three-point statistics are unbiased,
and that over the scales of interest for baryon acoustic oscillations and
redshift-space distortions, the variance is greatly reduced in the two-point
statistics and in the cross-correlation between halos and cosmic voids, but is
not reduced significantly for the three-point statistics. We demonstrate that
the accuracy of the two-point correlation function for a galaxy survey having
an effective volume of 20 ($h^{-1}$Gpc)$^3$ is improved by about a factor of
40, meaning that two pairs of simulations with a volume of 1 ($h^{-1}$Gpc)$^3$
lead to the equivalent variance of $sim$150 such simulations. The $N$-body
simulations presented here thus provide an effective survey volume of about
seven times the effective survey volume of DESI or Euclid. The data from this
project, including dark matter fields, halo catalogues, and their clustering
statistics, are publicly available at this http URL | | Source: | arXiv, 1811.2111 | | Services: | Forum | Review | PDF | Favorites | |
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