Density dependence of the MIT bag parameters from the field theory of hadrons

A self-consistent description of the MIT bag parameters as a function of the nuclear matter density is presented. The subnuclear degrees of freedom are treated in the Quark-Meson Coupling Model, considering the equilibrium conditions for the bag in the nuclear medium. The nuclear bulk properties are described in the framework of quantum field theory of hadrons through several interaction models. We have obtained the behavior of the MIT bag radius and the MIT bag parameters $B$ and $z_0$, taking their derivatives with respect to the mean field value of the scalar meson as free parameters. A discussion on the variation range of the derivatives is given. As an application, the EMC effect is studied and compared with previous results.