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Gradient expansion(s) and dark energy
Motivated by recent claims stating that the acceleration of the present Universe is due to fluctuations with wavelength larger than the Hubble radius, we present a general analysis of various perturbative solutions of fully inhomogeneous Einstein equations supplemented by a perfect fluid. The equiva...
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| Lenguaje: | eng |
| Publicado: |
2005
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| Acceso en línea: | https://dx.doi.org/10.1088/1475-7516/2005/09/009 http://cds.cern.ch/record/847735 |
| _version_ | 1780906889616293888 |
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| author | Giovannini, Massimo |
| author_facet | Giovannini, Massimo |
| author_sort | Giovannini, Massimo |
| collection | CERN |
| description | Motivated by recent claims stating that the acceleration of the present Universe is due to fluctuations with wavelength larger than the Hubble radius, we present a general analysis of various perturbative solutions of fully inhomogeneous Einstein equations supplemented by a perfect fluid. The equivalence of formally different gradient expansions is demonstrated. If the barotropic index vanishes, the deceleration parameter is always positive semi-definite. |
| id | cern-847735 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2005 |
| record_format | invenio |
| spelling | cern-8477352019-09-30T06:29:59Zdoi:10.1088/1475-7516/2005/09/009http://cds.cern.ch/record/847735engGiovannini, MassimoGradient expansion(s) and dark energyAstrophysics and AstronomyMotivated by recent claims stating that the acceleration of the present Universe is due to fluctuations with wavelength larger than the Hubble radius, we present a general analysis of various perturbative solutions of fully inhomogeneous Einstein equations supplemented by a perfect fluid. The equivalence of formally different gradient expansions is demonstrated. If the barotropic index vanishes, the deceleration parameter is always positive semi-definite.astro-ph/0506715CERN-PH-TH-2005-115oai:cds.cern.ch:8477352005-06-29 |
| spellingShingle | Astrophysics and Astronomy Giovannini, Massimo Gradient expansion(s) and dark energy |
| title | Gradient expansion(s) and dark energy |
| title_full | Gradient expansion(s) and dark energy |
| title_fullStr | Gradient expansion(s) and dark energy |
| title_full_unstemmed | Gradient expansion(s) and dark energy |
| title_short | Gradient expansion(s) and dark energy |
| title_sort | gradient expansion(s) and dark energy |
| topic | Astrophysics and Astronomy |
| url | https://dx.doi.org/10.1088/1475-7516/2005/09/009 http://cds.cern.ch/record/847735 |
| work_keys_str_mv | AT giovanninimassimo gradientexpansionsanddarkenergy |