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Journal article

Errors in Estimating Omega_Lambda due to the Fluid Approximation

Abstract:
The matter content of the Universe is strongly inhomogeneous on small scales. Motivated by this fact, we consider a model of the Universe that has regularly spaced discrete masses, rather than a continuous fluid. The optical properties of such space-times can differ considerably from the continuous fluid case, even if the 'average' dynamics are the same. We show that these differences have consequences for cosmological parameter estimation, and that fitting to recent supernovae observations gives a correction to the inferred value of Omega_Lambda of ~10%.
Publication status:
Published

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Publisher copy:
10.1088/1475-7516/2009/10/026

Authors

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Institution:
University of Oxford
Division:
MPLS
Department:
Physics
Sub department:
Astrophysics
Role:
Author

Journal:
JCAP More from this journal
Volume:
0910
Issue:
10
Pages:
26
Publication date:
2009-08-31
DOI:
EISSN:
1475-7516
ISSN:
1475-7516

Keywords:
Pubs id:
pubs:26383
UUID:
uuid:2545533a-ba5f-4af0-8199-a49b997a6e37
Local pid:
pubs:26383
Source identifiers:
26383
Deposit date:
2012-12-19

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