Strategies to Ascertain the Sign of the Spatial Curvature
Autor: | Diego Pavón, Pedro C. Ferreira |
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Rok vydání: | 2016 |
Předmět: |
Physics
mathematical cosmology spatial curvatur thermodynamics Deceleration parameter 010308 nuclear & particles physics General relativity General Physics and Astronomy Non-standard cosmology Astrophysics::Cosmology and Extragalactic Astrophysics Curvature 01 natural sciences Physical cosmology Metric expansion of space General Relativity and Quantum Cosmology Theoretical physics Spatial curvatur 0103 physical sciences Dark energy Thermodynamics Mathematical cosmology 010303 astronomy & astrophysics Dark fluid |
Zdroj: | Repositório Institucional da UFRN Universidade Federal do Rio Grande do Norte (UFRN) instacron:UFRN Dipòsit Digital de Documents de la UAB Universitat Autònoma de Barcelona Recercat: Dipósit de la Recerca de Catalunya Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) Recercat. Dipósit de la Recerca de Catalunya instname Universe; Volume 2; Issue 4; Pages: 27 |
ISSN: | 2218-1997 |
DOI: | 10.3390/universe2040027 |
Popis: | The second law of thermodynamics, in the presence of gravity, is known to hold at small scales, as in the case of black holes and self-gravitating radiation spheres. Using the Friedmann–Lemaitre–Robertson–Walker metric and the history of the Hubble factor, we argue that this law also holds at cosmological scales. Based on this, we study the connection between the deceleration parameter and the spatial curvature of the metric, Ω k , and set limits on the latter, valid for any homogeneous and isotropic cosmological model. Likewise, we devise strategies to determine the sign of the spatial curvature index k. Finally, assuming the lambda cold dark matter model is correct, we find that the acceleration of the cosmic expansion is increasing today. |
Databáze: | OpenAIRE |
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