2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/17540A new type of two phase coexistence in a vibrated granular material is reported, in the limit where energy transfer between the particles and the bottom wall occurs due to discrete collisions. A horizontally homogeneous bed develops inhomogeneities in which a dense and a dilute phase separate and coexist. The dilute region resembles a gas, while the dense region is like a liquid with a velocity distribution very different from a Gaussian.REVTeX4/REVTeX, 4 pages, 5 figuresStatistical MechanicsSoft Condensed Mattertext