Stability analysis and constraints on interacting viscous cosmology
Fecha
2020
Autores
Profesor Guía
Formato del documento
Articulo
ORCID Autor
Título de la revista
ISSN de la revista
Título del volumen
Editor
American Physical Society
Ubicación
ISBN
ISSN
item.page.issne
item.page.doiurl
Facultad
Facultad de Ciencias
Departamento o Escuela
Instituto de Fisica y Astronomia
Determinador
Recolector
Especie
Nota general
Varios autores
Resumen
In this work we study the evolution of a spatially flat Universe by considering a viscous dark matter and perfect fluids for dark energy and radiation, including an interaction term between dark matter and dark energy. In the first part, we analyse the general properties of the Universe by performing a stability analysis and then we constrain the free parameters of the model using the latest and cosmological-independent measurements of the Hubble parameter. We find consistency between the viscosity coefficient and the condition imposed by the second law of the Thermodynamics. The second part is dedicated to constrain the free parameter of the interacting viscous model (IVM) for three particular cases: the viscous model (VM), interacting model (IM), and the perfect fluid case (the concordance model). We report the deceleration parameter to be q0=−0.54+0.06−0.05, −0.58+0.05−0.04, −0.58+0.05−0.05, −0.63+0.02−0.02, together with the jerk parameter as j0=0.87+0.06−0.09, 0.94+0.04−0.06, 0.91+0.06−0.10, 1.0 for the IVM, VM, IM, and LCDM respectively, where the uncertainties correspond at 68\% CL. Worth mentioning that all the particular cases are in good agreement with LCDM, in some cases producing even better fits, with the advantage of eliminating some problems that afflicts the standard cosmological model.
Descripción
Lugar de Publicación
Auspiciador
Palabras clave
COSMOLOGY AND NONGALACTIC ASTROPHYSICS, GENERAL RELATIVITY AND QUANTUM COSMOLOGY