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We investigate the full phase diagram of a column of grains near jamming, asa function of varying levels of frustration. Frustration is modelled by theeffect of two opposing fields on a grain, due respectively to grains above andbelow it. The resulting four dynamical regimes (ballistic, logarithmic,activated and glassy) are characterised by means of the jamming time ofzero-temperature dynamics, and of the statistics of attractors reached by thelatter. Shape effects are most pronounced in the cases of strong and weakfrustration, and essentially disappear around a mean-field point.

The effects of grain shape and frustration in a granular column near jamming