Imperial College London
Alternate

Professor Andrew H Jaffe

Faculty of Natural Sciences, Department of Physics

Professor of Astrophysics and Cosmology
 
 
 
//

Contact

 

+44 (0)20 7594 7526a.jaffe Website

 
 
//

Assistant

 

Miss Louise Hayward +44 (0)20 7594 7679

 
//

Location

 

1018BBlackett LaboratorySouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Leclercq:2020:0004-6361/202037995,
author = {Leclercq, F and Faure, B and Lavaux, G and Wandelt, BD and Jaffe, AH and Heavens, AF and Percival, WJ and Noûs, C},
doi = {0004-6361/202037995},
journal = {Astronomy and Astrophysics: a European journal},
title = {Perfectly parallel cosmological simulations using spatial comoving  Lagrangian acceleration},
url = {http://dx.doi.org/10.1051/0004-6361/202037995},
volume = {639},
year = {2020}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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.
AU  - Leclercq,F
AU  - Faure,B
AU  - Lavaux,G
AU  - Wandelt,BD
AU  - Jaffe,AH
AU  - Heavens,AF
AU  - Percival,WJ
AU  - Noûs,C
DO  - 0004-6361/202037995
PY  - 2020///
SN  - 0004-6361
TI  - Perfectly parallel cosmological simulations using spatial comoving  Lagrangian acceleration
T2  - Astronomy and Astrophysics: a European journal
UR  - http://dx.doi.org/10.1051/0004-6361/202037995
UR  - http://arxiv.org/abs/2003.04925v2
UR  - http://hdl.handle.net/10044/1/80622
VL  - 639
ER  -
Download