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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 
to 
at the present day. The emergence of the spatial curvature is associated with 
and 
being smaller by approximately 0.05 compared to the ΛCDM.
to at the present day. The emergence of the spatial curvature is associated with and 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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