Abstract
In granular media under compression, the forces are transmitted in a very heterogeneous way as can be seen from photoelasticity experiments. This strong heterogeneity has consequences not only for mechanical properties: for instance, the conductance of a granular 2-, or 3-dimensional conducting medium as a function of stress follows a power law with an exponent which is different from the microscopic Hertz exponent and depends on the disorder of the structure. We propose a simple explanation.
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