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arXiv 0709.1325cond-mat.stat-mech
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相互作用粒子系统的动力学:随机过程与场论

Dynamics of interacting particle systems: stochastic process and field theory

Alexandre lefevre, Giulio Biroli

摘要:

我们提出了一种相互作用粒子系统的动力学方法,它允许从纯粹的随机考虑导出路径积分公式。我们表明,由此产生的场论是一个双重版本的土井和Peliti的标准理论。这既澄清了两种方法之间Cole-Hopf映射的起源,也澄清了反应扩散系统的有效Langevin方程中虚噪声的存在.我们的方法的优点是,它直接集中在密度场。我们展示了一些应用,特别是在零程过程,流体动力学极限和大偏差功能。

英文摘要:

We present an approach to the dynamics of interacting particle systems, which allows to derive path integral formulas from purely stochastic considerations. We show that the resulting field theory is a dual version of the standard theory of Doi and Peliti. This clarify both the origin of the Cole-Hopf map between the two approaches and the occurence of imaginary noises in effective Langevin equations for reaction-diffusion systems. The advantage of our approach is that it focuses directly on the density field. We show some applications, in particular on the Zero Range Process, hydrodynamic limits and large deviation functional.

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