Abstract
The standard model of cosmology describes relatively in a satisfactory way, the major stages of the evolution of the observable universe, over time. Despite its success, it presents some problems that constitute a puzzle nowadays. Among them, we cite the horizon problem, which is the purpose of this paper to study and present the different solutions that are available in the literature.The inflationary model, originally introduced by A. Guth in 1981, was designed to solve the horizon, flatness and entropy problems. Since then, we are faced now with more than 200 inflationary models. However, space missions, for to test the validity of some cosmological models (Planck 2013, 2015…) show that the universe follows the simplest proposed inflationary theories.In this work, we will study some models proposed as a solution to the horizon problem.
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