Errors in Estimating Omega_Lambda due to the Fluid Approximation
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...
| Main Authors: | , |
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| Format: | Journal article |
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2009
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| _version_ | 1797058771158040576 |
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| author | Clifton, T Ferreira, P |
| author_facet | Clifton, T Ferreira, P |
| author_sort | Clifton, T |
| collection | OXFORD |
| description | 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%. |
| first_indexed | 2024-03-06T19:55:02Z |
| format | Journal article |
| id | oxford-uuid:2545533a-ba5f-4af0-8199-a49b997a6e37 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T19:55:02Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | oxford-uuid:2545533a-ba5f-4af0-8199-a49b997a6e372022-03-26T11:54:47ZErrors in Estimating Omega_Lambda due to the Fluid ApproximationJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:2545533a-ba5f-4af0-8199-a49b997a6e37Symplectic Elements at Oxford2009Clifton, TFerreira, PThe 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%. |
| spellingShingle | Clifton, T Ferreira, P Errors in Estimating Omega_Lambda due to the Fluid Approximation |
| title | Errors in Estimating Omega_Lambda due to the Fluid Approximation |
| title_full | Errors in Estimating Omega_Lambda due to the Fluid Approximation |
| title_fullStr | Errors in Estimating Omega_Lambda due to the Fluid Approximation |
| title_full_unstemmed | Errors in Estimating Omega_Lambda due to the Fluid Approximation |
| title_short | Errors in Estimating Omega_Lambda due to the Fluid Approximation |
| title_sort | errors in estimating omega lambda due to the fluid approximation |
| work_keys_str_mv | AT cliftont errorsinestimatingomegalambdaduetothefluidapproximation AT ferreirap errorsinestimatingomegalambdaduetothefluidapproximation |