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Gravitational entropy and the cosmological no-hair conjecture


Bolejko, K, Gravitational entropy and the cosmological no-hair conjecture, Physical Review D, 97 Article 083515. ISSN 2470-0010 (2018) [Refereed Article]

Copyright Statement

Copyright 2018 American Physical Society

DOI: doi:10.1103/PhysRevD.97.083515


The gravitational entropy and no-hair conjectures seem to predict contradictory future states of our Universe. The growth of the gravitational entropy is associated with the growth of inhomogeneity, while the no-hair conjecture argues that a universe dominated by dark energy should asymptotically approach a homogeneous and isotropic de Sitter state. The aim of this paper is to study these two conjectures. The investigation is based on the Simsilun simulation, which simulates the universe using the approximation of the Silent Universe. The Silent Universe is a solution to the Einstein equations that assumes irrotational, nonviscous, and insulated dust, with vanishing magnetic part of the Weyl curvature. The initial conditions for the Simsilun simulation are sourced from the Millennium simulation, which results with a realistically appearing but relativistic at origin simulation of a universe. The Simsilun simulation is evolved from the early universe (t = 25 Myr) until far future (t = 1000 Gyr). The results of this investigation show that both conjectures are correct. On global scales, a universe with a positive cosmological constant and nonpositive spatial curvature does indeed approach the de Sitter state. At the same time it keeps generating the gravitational entropy.

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:149755
Year Published:2018
Funding Support:Australian Research Council (FT140101270)
Web of Science® Times Cited:6
Deposited By:Physics
Deposited On:2022-04-10
Last Modified:2022-05-05

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