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The nature of most probable paths at finite temperatures

机译:有限温度下最可能路径的性质

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We determine the most probable length of paths at finite temperatures, with a preassigned end-to-end distance and a unit of energy assigned to every step on a D-dimensional hypercubic lattice. The asymptotic form of the most probable path-length shows a transition from the directed walk nature at low temperatures to the random walk nature as the temperature is raised to it critical value T-c. We find T-c = 1/(ln2 + lnD). Below T-c the most probable path-length shows a crossover from the random walk nature for small end-to-end distance to the directed walk nature for large end-to-end distance; the crossover length diverges as the temperature approaches T-c. For every temperature above T-c we find that there is a maximum end-to-end distance beyond which a most probable path-length does not exist. [References: 9]
机译:我们确定了在有限温度下最可能的路径长度,并指定了端到端的距离,并为D维超立方晶格上的每个步骤分配了一个能量单位。当温度升高到临界值T-c时,最可能的路径长度的渐近形式显示出从低温下的定向行走特性到随机行走特性的过渡。我们发现T-c = 1 /(ln2 + lnD)。在T-c以下,最可能的路径长度显示了从较小端到端距离的随机行走特性到较大端到端距离的定向行走特性的交叉。随着温度接近T-c,交叉长度会发散。对于高于T-c的每个温度,我们发现存在最大的端到端距离,超过该最大距离则不存在最可能的路径长度。 [参考:9]

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