Exploring a matter-dominated model with bulk viscosity to drive the accelerated expansion of the Universe

Understand

We explore the viability of a bulk viscous matter-dominated Universe to explain the present accelerated expansion of the Universe.

• The model is composed by a pressureless fluid with bulk viscosity of the form \zeta = \zeta_0 + \zeta_1 * H where \zeta_0 and \zeta_1 are constants and H is the Hubble parameter.
• The pressureless fluid characterizes both the baryon and dark matter components.
• We study the behavior of the Universe according to this model analyzing the scale factor as well as some curvature scalars and the matter density.