Can a matter-dominated model with constant bulk viscosity drive the accelerated expansion of the universe?

Understand

We test a cosmological model which the only component is a pressureless fluid with a constant bulk viscosity as an explanation for the present accelerated expansion of the universe.

• We classify all the possible scenarios for the universe predicted by the model according to their past, present and future evolution and we test its viability performing a Bayesian statistical analysis using the SCP ``Union'' data set (307 SNe Ia), imposing the second law of thermodynamics on the dimensionless constant bulk viscous coefficient \zeta and comparing the predicted age of the universe by the model with the constraints coming from the oldest globular clusters.
• The best estimated values found for \zeta and the Hubble constant Ho are: \zeta=1.922 \pm 0.089 and Ho=69.62 \pm 0.59 km/s/Mpc with a \chi^2=314.
• The age of the universe is found to be 14.95 \pm 0.42 Gyr.