Distribution of velocities and acceleration for a particle in Brownian correlated disorder: inertial case

Abstract

We study the motion of an elastic object driven in a disordered environment in presence of both dissipation and inertia. We consider random forces with the statistics of random walks and reduce the problem to a single degree of freedom. It is the extension of the mean field ABBM model in presence of an inertial mass m. While the ABBM model can be solved exactly, its extension to inertia exhibits complicated history dependence due to oscillations and backward motion. The characteristic scales for avalanche motion are studied from numerics and qualitative arguments. To make analytical progress we consider two variants which coincide with the original model whenever the particle moves only forward. Using a combination of analytical and numerical methods together with simulations, we characterize the distributions of instantaneous acceleration and velocity, and compare them in these three models. We show that for large driving velocity, all three models share the same large-deviation function for positive velocities, which is obtained analytically for small and large m, as well as for m =6/25. The effect of small additional thermal and quantum fluctuations can be treated within an approximate method.

42 pages

References in corpus (5)

• Anderson Transitions
• Exactly solvable model of avalanches dynamics for Barkhausen crackling noise
• Variable range hopping and quantum creep in one dimension
• Distribution of velocities in an avalanche
• Nonstationary dynamics of the Alessandro-Beatrice-Bertotti-Montorsi model

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• Theory and Experiments for Disordered Elastic Manifolds, Depinning, Avalanches, and Sandpiles