Dynamics of scalar perturbations in f(R,T) gravity

Understand

In the context of f(R,T) theories of gravity, we study the evolution of scalar cosmological perturbations in the metric formalism.

• According to restrictions on the background evolution, a specific model within these theories is assumed in order to guarantee the standard continuity equation.
• Using a completely general procedure, we find the complete set of differential equations for the matter density perturbations.
• In the case of sub-Hubble modes, the density contrast evolution reduces to a second-order equation.