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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.

Item Type:	Article
Authors/Creators:	Bolejko, K
Keywords:	gravitation, cosmology, astrophysics, large scale structure of the universe, particle dark matter
Journal or Publication Title:	Classical and Quantum Gravity
Publisher:	Iop Publishing Ltd
ISSN:	0264-9381
DOI / ID Number:	https://doi.org/10.1088/1361-6382/aa9d32
Copyright Information:	Copyright 2017 IOP Publishing Ltd
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