- Title
- The fitting problem in a lattice Universe
- Creator
- Larena, Julien
- Date Issued
- 2012
- Date
- 2012
- Type
- Text
- Identifier
- vital:6780
- Identifier
- http://hdl.handle.net/10962/d1012405
- Description
- We present a regular cubic lattice solution to Einstein field equations that is exact at second order in a small parameter. We show that this solution is kinematically equivalent to the Friedmann-Lemaitre-Robertson-Walker (FLRW) solution with the same averaged energy density. This allows us to discuss the fitting problem in that framework: are observables along the past lightcone of observers equivalent to those in the analogue FLRW model obtained by smoothing spatially the distribution of matter? We find a criterion on the compacity of the objects that must be satisfied in order for the answer to this question to be positive and given by perturbative arguments. If this criterion is not met, the answer to this question must be addressed fully non perturbatively along the past lightcone, even though the spacetime geometry can be described perturbatively.
- Description
- Prepared for the Proceedings of the conference 'Relativity and Gravitation: 100 years after Einstein in Prague', Prague, 25-29th June 2012.
- Format
- 7 pages
- Format
- Language
- English
- Relation
- Larena, J. The fitting problem in a lattice Universe. In: Relativity and Gravitation : 100 Years after Einstein in Prague, June 25 – 29, 2012, Prague, Czech Republic. (Submitted)
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RU Department of Mathematics (Pure and Applied)
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