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Relativistic numerical cosmology with silent universes

Citation

Bolejko, K, Relativistic numerical cosmology with silent universes, Classical and Quantum Gravity, 35, (2) Article 024003. ISSN 0264-9381 (2018) [Refereed Article]

Copyright Statement

Copyright 2017 IOP Publishing Ltd

DOI: doi:10.1088/1361-6382/aa9d32

Abstract

Relativistic numerical cosmology is most often based either on the exact solutions of the Einstein equations, or perturbation theory, or weak-field limit, or the BSSN formalism. The silent universe provides an alternative approach to investigate relativistic evolution of cosmological systems. The silent universe is based on the solution of the Einstein equations in 1  +  3 comoving coordinates with additional constraints imposed. These constraints include: the gravitational field is sourced by dust and cosmological constant only, both rotation and magnetic part of the Weyl tensor vanish, and the shear is diagnosable. This paper describes the code simsilun (free software distributed under the terms of the reposi General Public License), which implements the equations of the silent universe. The paper also discusses applications of the silent universe and it uses the Millennium simulation to set up the initial conditions for the code simsilun. The simulation obtained this way consists of 16 777 216 worldlines, which are evolved from z  =  80 to z  =  0. Initially, the mean evolution (averaged over the whole domain) follows the evolution of the background ΛCDM model. However, once the evolution of cosmic structures becomes nonlinear, the spatial curvature evolves from $\Omega_K =0$ to $\Omega_K \approx 0.1$ at the present day. The emergence of the spatial curvature is associated with $\Omega_M$ and $\Omega_\Lambda$ being smaller by approximately 0.05 compared to the ΛCDM.

Item Details

Item Type:Refereed Article
Keywords:gravitation, cosmology, astrophysics, large scale structure of the universe, particle dark matter
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Bolejko, K (Dr Krzysztof Bolejko)
ID Code:149754
Year Published:2018
Funding Support:Australian Research Council (FT140101270)
Web of Science® Times Cited:22
Deposited By:Physics
Deposited On:2022-04-10
Last Modified:2022-05-05
Downloads:0

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