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arXiv 1603.02205math-phmath.MP
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一步过程主方程的算子解法

Operator Approach to the Master Equation for the One-Step Process

M. Hnatich, E. G. Eferina, A. V. Korolkova, D. S. Kulyabov, L. A. Sevastyanov

摘要:

概率作为自然界的内在属性的呈现导致研究人员从确定性转向对现象的随机描述。给出了一步过程的随机化过程。它允许根据动力学方程的类型和关于过程性质的假设写下主方程。由于相互作用动力学经常发生在物理、化学、技术、生物、环境、经济和社会系统中,因此近年来受到人们的关注。然而,没有一般的方法来直接研究这个方程。我们可以得到福克-普朗克方程,从而得到朗之万方程。应当清楚地理解,这些方程是主方程的近似记录。然而,这并不能消除对主方程研究的需要。此外,在主方程分解期间产生的幂级数可能是发散的(例如,在空间模型中)。这使得经典的微扰理论无法应用。有人建议将量子场微扰理论用于统计系统(所谓的Doi方法)。这项工作是一种方法的材料,描述了基于量子场微扰理论方法的主方程解的原理。这项工作的特点是,它是理解的非专家在量子场论。作为示例,使用Verhulst模型,因为其简单和清晰(一阶方程与空间变量无关,但是包含非线性)。我们展示了一步过程主方程的获得和研究的算子和组合方法的完全等价性。

英文摘要:

Presentation of the probability as an intrinsic property of the nature leads researchers to switch from deterministic to stochastic description of the phenomena. The procedure of stochastization of one-step process was formulated. It allows to write down the master equation based on the type of of the kinetic equations and assumptions about the nature of the process. The kinetics of the interaction has recently attracted attention because it often occurs in the physical, chemical, technical, biological, environmental, economic, and sociological systems. However, there are no general methods for the direct study of this equation. Leaving in the expansion terms up to the second order we can get the Fokker-Planck equation, and thus the Langevin equation. It should be clearly understood that these equations are approximate recording of the master equation. However, this does not eliminate the need for the study of the master equation. Moreover, the power series produced during the master equation decomposition may be divergent (for example, in spatial models). This makes it impossible to apply the classical perturbation theory. It is proposed to use quantum field perturbation theory for the statistical systems (the so-called Doi method). This work is a methodological material that describes the principles of master equation solution based on quantum field perturbation theory methods. The characteristic property of the work is that it is intelligible for non-specialists in quantum field theory. As an example the Verhulst model is used because of its simplicity and clarity (the first order equation is independent of the spatial variables, however, contains non-linearity). We show the full equivalence of the operator and combinatorial methods of obtaining and study of the one-step process master equation.

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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