Analysing dissipative effects in the ΛcDM model

Norman Cruz, Esteban González, Samuel Lepe, DIego Sáez Chillón Gómez

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

In the present paper, the effects of viscous dark matter are analysed within the ΛCDM model. Here we consider bulk viscosity through the Israel-Stewart theory approach, leading to an effective pressure term in the continuity equation that accomplishes for the dissipative effects of the dark matter fluid. Then, the corresponding equation for viscosity is solved and a general equation for the Hubble parameter is obtained with the presence of a cosmological constant. The existence of de Sitter solutions is discussed, where a wider range of solutions is found in comparison to the ΛCDM model. Also the conditions for the near thermodynamical equilibrium of the fluid is analysed. Finally, a qualitative analysis provides some constraints on the model by using Supernovae Ia data which reveals the possible importance of causal thermodynamics in cosmology.

Original languageEnglish
Article number017
JournalJournal of Cosmology and Astroparticle Physics
Volume2018
Issue number12
DOIs
StatePublished - 11 Dec 2018
Externally publishedYes

Keywords

  • dark energy theory
  • dark matter theory

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