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arXiv 1107.5864cond-mat.stat-mech
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非线性漂移力驱动下的非平衡稳态

Nonequilibrium Steady State Driven by a Nonlinear Drift Force

Chulan Kwon, Ping Ao

摘要:

研究了在非线性漂移力驱动下,受非同分布独立噪声影响的随机系统的非平衡稳态的性质。非平衡稳态(NESS)电流是由漂移力的残余部分产生的,该残余部分未被噪声的扩散作用所抵消。从我们以前的研究线性漂移力的NESS电流被发现循环的等概率表面上的最大值在一个稳定的固定点的漂移力。对于非线性漂移力,我们使用微扰理论关于漂移力的三次和四次系数。我们发现一个有趣的潜在的景观图片的概率最大值从漂移力的不动点,而且,NESS电流有一个非平凡的循环,流过的等概率面,并有各种中心不位于概率最大值。计算机仿真结果与理论分析结果吻合较好。

英文摘要:

We investigate the properties of the nonequilibrium steady state for the stochastic system driven by a nonlinear drift force and influenced by noises which are not identically and independently distributed. The nonequilibrium steady state (NESS) current results from a residual part of the drift force which is not cancelled by the diffusive action of noises. From our previous study for the linear drift force the NESS current was found to circulate on the equiprobability surface with the maximum at a stable fixed point of the drift force. For the nonlinear drift force, we use the perturbation theory with respect to the cubic and quartic coefficients of the drift force. We find an interesting potential landscape picture where the probability maximum shifts from the fixed point of the drift force and, furthermore, the NESS current has a nontrivial circulation which flows off the equiprobability surface and has various centers not located at the probability maximum. The theoretical result is well confirmed by the computer simulation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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