2011/12/29 by H. Farajollahi, J. Sadeghi, M. Pourali +2 · 1 citation
Physics and Astronomy · #Astrophysics #Black Holes and Theoretical Physics #Classical mechanics #Cosmology #Cosmology and Gravitation Theories #Dark energy #Galaxies: Formation, Evolution, Phenomena #Geometry #Physics #Quintessence #Saddle #Saddle point #Theoretical physics #Universe #gr-qc #physics.gen-ph
paper · pdf · doi:10.1007/s10509-011-0969-2
published as Astrophysics and Space Science, 339, 1 79-85 (2012) · 15 pages, 12 figures
arxiv created 2011/12/29 · openalex publication_date 2012/01/17 · arxiv updated 2015/06/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Stability analysis of agegraphic dark energy in Brans-Dicke theory is presented in this paper. We constrain the model parameters with the observational data and thus the results become broadly consistent with those expected from experiment. Stability analysis of the model without best fitting shows that universe may begin from an unstable state passing a saddle point and finally become stable in future. However, with the best fitted model, There is no saddle intermediate state. The agegraphic dark energy in the model by itself exhibits a phantom behavior. However, contribution of cold dark matter on the effective energy density modifies the state of teh universe from phantom phase to quintessence one. The statefinder diagnosis also indicates that the universe leaves an unstable state in the past, passes the LCDM state and finally approaches the sable state in future.