SILVA, J. D. L.; http://lattes.cnpq.br/3246652623899229; SILVA, Joás Davi Lopes da.
Résumé:
In this work we aim to study and understand several concepts related to standard cosmologyand the theory of cosmological perturbation . In this dissertation we provide a base of theoretical foundations for this study. After reviewing various aspects of the standard cosmological model, we extended our study in cosmology to address deviations from the universe’s homogeneity. Small perturbation in homogeneity can develop in certain periods and phases of our Universe and such perturbations are related to gravitational instability. The growth of in homogeneities can be studied through the formalism of a first order perturbative theory. This mechanism started the formation of the structures that we see in the Universe today. In our work we have studied the dynamics of these perturbation both in the Newtonian context and in that of general relativity.