2014/06/20 by J. A. S. Lima, Leila L. Graef, L. L. Graef +4
Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Astrophysics #COSMIC cancer database #Cosmology #Cosmology and Gravitation Theories #Dark energy #Dark matter #De Sitter universe #Lambda-CDM model #Physical cosmology #Physics #Solar and Space Plasma Dynamics #Theoretical physics #Universe #gr-qc
paper · pdf · doi:10.1088/1475-7516/2014/10/042
9 pages, 1 figure
arxiv created 2014/06/20 · openalex publication_date 2014/10/17 · arxiv updated 2015/06/22 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A cosmic scenario with gravitationally induced particle creation is proposed. In this model the Universe evolves from an early to a late time de Sitter era, with the recent accelerating phase driven only by the negative creation pressure associated with the cold dark matter component. The model can be interpreted as an attempt to reduce the so-called cosmic sector (dark matter plus dark energy) and relate the two cosmic accelerating phases (early and late time de Sitter expansions). A detailed thermodynamic analysis including possible quantum corrections is also carried out. For a very wide range of the free parameters, it is found that the model presents the expected behavior of an ordinary macroscopic system in the sense that it approaches thermodynamic equilibrium in the long run (i.e., as it nears the second de Sitter phase). Moreover, an upper bound is found for the Gibbons–Hawking temperature of the primordial de Sitter phase. Finally, when confronted with the recent observational data, the current `quasi'-de Sitter era, as predicted by the model, is seen to pass very comfortably the cosmic background tests.