title: Fermi-like behavior of weakly vibrated granular matter.
abstract: Vertical movement of zirconia-yttria stabilized 2 mm balls is measured by a laser facility at the surface of a vibrated 3D granular matter under gravity. Realizations z(t) are measured from the top of the container by tuning the fluidized gap with a 1D measurement window in the direction of the gravity. The statistics obeys a Fermi-like configurational approach which is tested by the relation between the dispersions in amplitude and velocity. We introduce a generalized equipartition law to characterize the ensemble of particles which cannot be described in terms of a Brownian motion. The relation between global granular temperature and the external excitation frequency is established.
authors.affiliation: Saarland University, Saarbrücken Germany.
authors.forename: Jorge E
authors.initials: JE
authors.lastname: Fiscina
authors.forename: Manuel O
authors.initials: MO
authors.lastname: Cáceres