2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/115857Recent experiments with trapped alkali atoms have drawn enormous interest to the theoretical studies concerning Bose-Einstein condensation. The purpose of this paper is to review one of the approaches to study bosonic matter at zero temperature, namely the Bogoliubov approximation. Review of a necessary tool, the second quantization, will also be made.Quantum Physicstext