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Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Any: 2014, Tutor: Eduard Salvador Solé

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In this report we make a detailed derivation of Friedman Equations, which are the dy-
namical equations of a homogeneous and isotropic universe. First, we derive them in the framework
of the General Relativity keeping the relativistic expressions as a reference for the rest of the report.
Then, using the Newtonian formalism and solving some fundamental problems, we reach some dy-
namical equations for the universe and compare the results with the relativistic ones, focusing our attention on the meaning of the expressions and on the cosmological constant.