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We analyze the deviations from Maxwell-Boltzmann statistics found in
recent experiments studying velocity distributions in two-dimensional
granular gases driven into a non-equilibrium stationary state by a
strong vertical vibration. We show that in its simplest version,
the “stochastic thermostat”
model of heated inelastic hard spheres, contrary to what has been
hitherto stated, is incompatible with the experimental data, although
predicting a reminiscent high-velocity stretched-exponential behavior
with an exponent 3/2.
The experimental observations lead to refine a recently proposed
random restitution coefficient model. Very good agreement is then
found with experimental velocity distributions within this framework,
which appears self-consistent and further provides relevant probes to
investigate the universality of the velocity statistics
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