An alternative method to generate pre-initial conditions for cosmological N-body simulations

doi:10.1093/mnras/sty2523

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	An alternative method to generate pre-initial conditions for cosmological N-body simulations
	Liao, Shihong
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2018-12-01
卷号	481 期号:3 页码:3750-3760
关键词	methods: numerical dark matter large-scale structure of Universe
ISSN号	0035-8711
DOI	10.1093/mnras/sty2523
英文摘要	Currently, grid and glassmethods are the two most popular choices to generate uniform particle distributions (i.e. pre-initial conditions) for cosmological N-body simulations. In this article, we introduce an alternative method called the capacity constrained Voronoi tessellation (CCVT), which originates from computer graphics. As a geometrical equilibrium state, a CCVT particle configuration satisfies two constraints: (i) the volume of the Voronoi cell associated with each particle is equal; (ii) every particle is in the centre-of-mass position of its Voronoi cell. We show that the CCVT configuration is uniform and isotropic, follows perfectly the minimal power spectrum, P(k) proportional to k(4), and is quite stable under gravitational interactions. It is natural to incorporate periodic boundary conditions during CCVT making, therefore, we can obtain a larger CCVT by tiling with a small periodic CCVT. When applying the CCVT pre-initial condition to cosmological N-body simulations, we show that it plays as good as grid and glass schemes. The CCVT method will be helpful in studying the numerical convergence of pre-initial conditions in cosmological simulations. It can also be used to set up pre-initial conditions in smoothed-particle hydrodynamics simulations.
WOS关键词	PERTURBATION-THEORY ; DARK-MATTER ; EVOLUTION ; CLUSTERS ; FIELDS ; GRIDS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000450984100065
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/23651]
专题	中国科学院国家天文台
通讯作者	Liao, Shihong
作者单位	Chinese Acad Sci, Natl Astron Observ, Key Lab Computat Astrophys, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Liao, Shihong. An alternative method to generate pre-initial conditions for cosmological N-body simulations[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,481(3):3750-3760.
APA	Liao, Shihong.(2018).An alternative method to generate pre-initial conditions for cosmological N-body simulations.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,481(3),3750-3760.
MLA	Liao, Shihong."An alternative method to generate pre-initial conditions for cosmological N-body simulations".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 481.3(2018):3750-3760.