2018/09/30 by W. J. C. da Silva, W.J.C. da Silva, H. S. Gimenes +2 · 1 citation
Physics and Astronomy · #Astrophysics #Baryon #Baryon acoustic oscillations #Cold dark matter #Cosmic microwave background #Cosmological model #Cosmology #Cosmology and Gravitation Theories #Dark energy #Dark matter #Dissipative system #Galaxies: Formation, Evolution, Phenomena #Physics #Quantum mechanics #Statistical Mechanics and Entropy #Supernova #Theoretical physics #Universe #Viscosity #Volume viscosity #astro-ph.CO
paper · pdf · doi:10.1016/j.astropartphys.2018.10.002
published as Astroparticle Physics 105 (2019) 37-43 · 10 pages, 5 figures, 1 table. Expanded discussion in the Results and Conclusions. Added references
arxiv created 2018/10/01 · openalex publication_date 2018/10/10 · arxiv updated 2018/10/19 · openalex created_date 2019/06/27 · openalex updated_date 2026/08/05
In this work we discuss a general approach for the dissipative dark matter considering a nonextensive bulk viscosity and taking into account the role of generalized Friedmann equations. This generalized ΛCDM model encompasses a flat universe with a dissipative nonextensive viscous dark matter component, following the Eckart theory of bulk viscosity. In order to compare models and constrain cosmological parameters, we perform Bayesian analysis using one of the most recent observations of Type Ia Supernova, baryon acoustic oscillations, and cosmic microwave background data.