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Perfectly parallel cosmological simulations using spatial comoving Lagrangian acceleration

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Title: Perfectly parallel cosmological simulations using spatial comoving Lagrangian acceleration
Authors: Leclercq, F
Faure, B
Lavaux, G
Wandelt, BD
Jaffe, AH
Heavens, AF
Percival, WJ
Noûs, C
Item Type: Journal Article
Abstract: Context. Existing cosmological simulation methods lack a high degree of parallelism due to the long-range nature of the gravitational force, which limits the size of simulations that can be run at high resolution. Aims. To solve this problem, we propose a new, perfectly parallel approach to simulate cosmic structure formation, which is based on the spatial COmoving Lagrangian Acceleration (sCOLA) framework. Methods. Building upon a hybrid analytical and numerical description of particles’ trajectories, our algorithm allows for an efficient tiling of a cosmological volume, where the dynamics within each tile is computed independently. As a consequence, the degree of parallelism is equal to the number of tiles. We optimised the accuracy of sCOLA through the use of a buffer region around tiles and of appropriate Dirichlet boundary conditions around sCOLA boxes. Results. As a result, we show that cosmological simulations at the degree of accuracy required for the analysis of the next generation of surveys can be run in drastically reduced wall-clock times and with very low memory requirements. Conclusions. The perfect scalability of our algorithm unlocks profoundly new possibilities for computing larger cosmological simulations at high resolution, taking advantage of a variety of hardware architectures.
Issue Date: 1-Jul-2020
Date of Acceptance: 15-May-2020
URI: http://hdl.handle.net/10044/1/80622
DOI: 10.1051/0004-6361/202037995
ISSN: 0004-6361
Publisher: EDP Sciences
Journal / Book Title: Astronomy and Astrophysics: a European journal
Volume: 639
Copyright Statement: © 2020 ESO.
Keywords: astro-ph.CO
Astronomy & Astrophysics
0201 Astronomical and Space Sciences
Notes: 24 pages, 8 figures, 2 tables. added references to match submitted version
Publication Status: Published
Article Number: ARTN A91
Online Publication Date: 2020-07-14
Appears in Collections:Physics