Dynamics of a lattice Universe : the dust approximation in cosmology

Title: Dynamics of a lattice Universe : the dust approximation in cosmology
Creator: Bruneton, J-P
Creator: Larena, Julien
Date Issued: 2012
Date: 2012
Type: Article
Identifier: vital:6789
Identifier: http://hdl.handle.net/10962/d1006941
Description: We find a solution to Einstein field equations for a regular toroidal lattice of size L with equal masses M at the centre of each cell; this solution is exact at order M/L. Such a solution is convenient to study the dynamics of an assembly of galaxy-like objects. We find that the solution is expanding (or contracting) in exactly the same way as the solution of a Friedman–Lemaître–Robertson–Walker Universe with dust having the same average density as our model. This points towards the absence of backreaction in a Universe filled with an infinite number of objects, and this validates the fluid approximation, as far as dynamics is concerned, and at the level of approximation considered in this work.
Format: 15 pages
Format: pdf
Language: English
Relation: Bruneton, J-P. and Larena, J (2012) Dynamics of a lattice Universe: the dust approximation in cosmology. Classical and quantum gravity, 29 155001 Available at: http://dx.doi.org/10.1088/0264-9381/29/15/155001

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