Two fluid cosmology in scale-covariant gravitation

This work applies the scale-covariant formalism proposed by Canuto et al. to describe a universe with a Chaplygin constituent and a barotropic gas as gravitational sources, supposing a direct energy exchange between those fluids. This is implemented in the form of a dynamical pressure term. It is established a mapping between an old decelerated-accelerated universe ruled by Einstein equations and an early universe, where a modified general relativity theory rules space-time, besides new equations of state. The basic properties of sources, energy density evolution and acceleration regimes for that primordial regime are a direct consequence of the application of the scale-covariant theory. Moreover, a discussion and a comparison with previously formulated individual cases is presented.