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Cálculo didáctico de la edad del Universo y la importancia de la constante cosmológica en un modelo FRW

Author(s): Rafael Hernández Jiménez | Claudia Moreno | Daniel Sánchez Guzmán | Ricardo García Salcedo

Journal: Latin-American Journal of Physics Education
ISSN 1870-9095

Volume: 5;
Issue: 3;
Start page: 556;
Date: 2011;
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Keywords: Cosmological model FRW | Age of the Universe | Cosmological observations.

Starting with the Friedmann-Robertson-Walker (FRW) cosmological model, we can find an explicit solution for the scale factor a(t) using the baryotropic equation of estat and the Friedmann equation. This barotropic equation describes several types of matter (energy): non-relativistic matter, radiation and vacuum energy (cosmological constant), therefore exists an explicit expression for a=a(t) that at the same time relates to a density of energy ρ=ρ(t) for each component. It is considered that each stage of the Universe was dominated by one type of material, and the expressions that describe the time evolution are independent each other. By using experimental data from [1] the calculations of the age of the Universe for each type of matter are carried out
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