arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0907.3481cond-mat.stat-mechcond-mat.dis-nn
收藏

非平衡态热力学与电流拓扑

Non-Equilibrium Thermodynamics and Topology of Currents

Vladimir Y. Chernyak, Michael Chertkov, Sergey V. Malinin, Razvan Teodorescu

摘要:

在许多实验情况下,物理系统经历随机演化,可以通过两个紧凑空间之间的随机映射来描述。在目前的工作中,我们研究的适用性大偏差理论的时间平均量描述这样的随机地图,特别是时间平均电流和密度泛函。我们推导出这些量的大偏差原理,以及全球拓扑电流,并制定变分,热力学关系建立大偏差性质的拓扑电流。我们说明了一个非平凡的例子,海森堡自旋链的拓扑驱动的Wess-Zumino型的理论。拓扑流的克拉美尔泛函被发现明确在瞬子气体制度的自旋链模型在弱噪声限制。在Morse理论的背景下,我们讨论了一个一般的减少连续随机模型与弱噪声有效的马尔可夫链描述稳定不动点之间的转移。

英文摘要:

In many experimental situations, a physical system undergoes stochastic evolution which may be described via random maps between two compact spaces. In the current work, we study the applicability of large deviations theory to time-averaged quantities which describe such stochastic maps, in particular time-averaged currents and density functionals. We derive the large deviations principle for these quantities, as well as for global topological currents, and formulate variational, thermodynamic relations to establish large deviation properties of the topological currents. We illustrate the theory with a nontrivial example of a Heisenberg spin-chain with a topological driving of the Wess-Zumino type. The Cramér functional of the topological current is found explicitly in the instanton gas regime for the spin-chain model in the weak-noise limit. In the context of the Morse theory, we discuss a general reduction of continuous stochastic models with weak noise to effective Markov chains describing transitions between stable fixed points.

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。

↑