Compacts Objects are an important group of astronomic objects in astrophysics research. Different mathematical formulations that allow to solve Einstein´s field equations have been used to describe the behavior of objects submitted to strong gravitational fields known as neutron stars, quasars and white dwarfs. The physics of ultrahigh densities is not well understood and many of the compact objects studies have been performed within the framework of the MIT bag model. In this model, the equation of state has a simple linear form given by P=1/3(ρ-4B) where is the energy density, p is the isotropic pressure and B is the bag constant. However, in theoretical works of realistic stellar models it has been suggested that superdense matter may be anisotropic, at least in some density ranges. The existence of anisotropy within a star can be explained by the presence of a solid core, phase transitions, a type III super fluid, a pion condensation and other physical phenomena. In such systems, the radial pressure is different from the tangential pressure. This generalization has been used in the study of the balance and collapse of compact spheres.
Aims and Scope: 1. Search of exact solutions of Einstein's field equations for compact objects 2. Study of the physical properties of the neutrons stars , white dwarfs and quasars 3. Models of compact objects with different gravitational potentials 4. Models of compact stars with different equations of state 5. Models of compact stars with charge distributions