2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148969There is plenty of evidence that most matter in the Universe is dark (non-luminous). Particle physics offers several possible explanations. In this talk I focus on cold dark matter; the most promising candidates are then axions and the lightest supersymetric particle. I briefly summarize estimates of the present relic density of these particles, and describe efforts to detect them14 pages, 4 enclosed figures. Replaced to (hopefully) solve problems with printing of first figureHigh Energy Physics - Phenomenologytext