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arXiv 1104.2629cond-mat.dis-nncond-mat.stat-mech
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雪崩中的速度分布

Distribution of velocities in an avalanche

Pierre Le Doussal, Kay Joerg Wiese

摘要:

对于在脱钉附近的受驱动弹性物体,我们从第一性原理导出了雪崩中的瞬时速度分布。证明了在上临界维数d >= duc以上,质心速度的n次分布与ABBM随机方程的预测是等价的.我们的方法允许从瞬子方程计算空间和时间依赖性。我们将计算推广到平均场以外的最低阶,即n = duc-d。

英文摘要:

For a driven elastic object near depinning, we derive from first principles the distribution of instantaneous velocities in an avalanche. We prove that above the upper critical dimension, d >= d_uc, the n-times distribution of the center-of-mass velocity is equivalent to the prediction from the ABBM stochastic equation. Our method allows to compute space and time dependence from an instanton equation. We extend the calculation beyond mean field, to lowest order in epsilon=d_uc-d.

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