2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41343In these lectures, we develop the theory of the Colour Glass Condensate. This is the matter made of gluons in the high density environment characteristic of deep inelastic scattering or hadron-hadron collisions at very high energy. The lectures are self contained and comprehensive. They start with a phenomenological introduction, develop the theory of classical gluon fields appropriate for the Colour Glass, and end with a derivation and discussion of the renormalization group equations which determine this effective theory.74 pages, Lectures given at the NATO Advanced Study Institute ``QCD perspectives on hot and dense matter'', August 6--18, 2001, in Cargèse, Corsica, FranceHigh Energy Physics - Phenomenologytext