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Numerical convergence of pre-initial conditions on dark matter halo properties

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Title
Numerical convergence of pre-initial conditions on dark matter halo properties
Author(s)
Tianchi Zhang; Shihong Liao; Ming Li; Jiajun Zhang
Publication Date
2021-11-01
Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, v.507, no.4, pp.6161 - 6176
Publisher
OXFORD UNIV PRESS
Abstract
© 2021 The Author(s)Published by Oxford University Press on behalf of Royal Astronomical SocietyGenerating pre-initial conditions (or particle loads) is the very first step to set up a cosmological N-body simulation. In this work, we revisit the numerical convergence of pre-initial conditions on dark matter halo properties using a set of simulations which only differs in initial particle loads, i.e. grid, glass, and the newly introduced capacity constrained Voronoi tessellation (CCVT). We find that the median halo properties agree fairly well (i.e. within a convergence level of a few per cent) among simulations running from different initial loads. We also notice that for some individual haloes cross-matched among different simulations, the relative difference of their properties sometimes can be several tens of per cent. By looking at the evolution history of these poorly converged haloes, we find that they are usually merging haloes or haloes have experienced recent merger events, and their merging processes in different simulations are out-of-sync, making the convergence of halo properties become poor temporarily. We show that, comparing to the simulation starting with an anisotropic grid load, the simulation with an isotropic CCVT load converges slightly better to the simulation with a glass load, which is also isotropic. Among simulations with different pre-initial conditions, haloes in higher density environments tend to have their properties converged slightly better. Our results confirm that CCVT loads behave as well as the widely used grid and glass loads at small scales, and for the first time we quantify the convergence of two independent isotropic particle loads (i.e. glass and CCVT) on halo properties.
URI
https://pr.ibs.re.kr/handle/8788114/10535
DOI
10.1093/mnras/stab2543
ISSN
0035-8711
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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