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Article Dans Une Revue Physical Review E Année : 2016

Transport in the barrier billiard

Résumé

We investigate transport properties of an ensemble of particles moving inside an infinite periodic horizontal planar barrier billiard. A particle moves among bars and elastically reflects on them. The motion is a uniform translation along the bars' axis. When the tangent of the incidence angle, alpha , is fixed and rational, the second moment of the displacement along the orthogonal axis at time n , , is either bounded or asymptotic to K n2 , when n -->∞ . For irrational alpha , the collision map is ergodic and has a family of weakly mixing observables, the transport is not ballistic, and autocorrelation functions decay only in time average, but may not decay for a family of irrational alpha 's. An exhaustive numerical computation shows that the transport may be superdiffusive or subdiffusive with various rates or bounded strongly depending on the values of alpha . The variety of transport behaviors sounds reminiscent of well-known behavior of conservative systems. Considering then an ensemble of particles with nonfixed alpha , the system is nonergodic and certainly not mixing and has anomalous diffusion with self-similar space-time properties. However, we verified that such a system decomposes into ergodic subdynamics breaking self-similarity.
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Dates et versions

hal-03729655 , version 1 (20-07-2022)

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S. M. Saberi Fathi, W. Ettoumi, M. Courbage. Transport in the barrier billiard. Physical Review E , 2016, 93, ⟨10.1103/PhysRevE.93.062216⟩. ⟨hal-03729655⟩
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