Exact Evolution of Discrete Relativistic Cosmological Models

Autor:	Clifton, Timothy, Gregoris, Daniele, Rosquist, Kjell, Tavakol, Reza
Rok vydání:	2013
Předmět:	General Relativity and Quantum Cosmology Astrophysics - Cosmology and Nongalactic Astrophysics
Zdroj:	JCAP 11(2013)010
Druh dokumentu:	Working Paper
DOI:	10.1088/1475-7516/2013/11/010
Popis:	We study the effects of inhomogeneities on the evolution of the Universe, by considering a range of cosmological models with discretized matter content. This is done using exact and fully relativistic methods that exploit the symmetries in and about submanifolds of spacetimes that themselves possess no continuous global symmetries. These methods allow us to follow the evolution of our models throughout their entire history, far beyond what has previously been possible. We find that while some space-like curves collapse to anisotropic singularities in finite time, others remain non-singular forever. The resulting picture is of a cosmological spacetime in which some behaviour remains close to Friedmann-like, while other behaviours deviate radically. In particular, we find that large-scale acceleration is possible without any violation of the energy conditions. Comment: 46 pages, 23 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1309.2876 Zobrazit plný text záznamu View this record from Arxiv