On the canonical distributions of a thermal particle in a generalized velocity-dependent potential

On the canonical distributions of a thermal particle in a generalized velocity-dependent potential
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关于广义速度相关势中热粒子的正则分布

DOI:
10.1016/j.physa.2019.123273
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发表时间:
2020
期刊:
Physica A: Statistical Mechanics and its Applications
影响因子:
--
通讯作者:
Matsuzoe Hiroshi
Matsuzoe Hiroshi
中科院分区:
--
文献类型:
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作者:
Wada Tatsuaki;Scarfone Antonio M.;Matsuzoe Hiroshi

文献摘要

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考虑了在速度空间中的热粒子扩散问题,其势函数为粒子速度v和控制参数vc的反双曲正弦函数,势函数为广义速度相关势。这种速度相关势可以看作是瑞利耗散函数的变形。相应的Fokker-Planck方程的定态是一个正则概率分布。此外,适当的重新参数化将该定态与κ-变形高斯相关联。提出了变形参数κ的一种可能的解释。
We consider a thermal particle diffusing in velocity-space under a generalized velocity-dependent potential characterized by the inverse hyperbolic sine function of the particle velocity v and the control parameter v c. This velocity-dependent potential can be considered as a deformation of Rayleigh’s dissipation function. The stationary state of the corresponding Fokker–Planck equation is shown to be a canonical probability distribution. Furthermore an appropriate re-parameterization relates this stationary state with the κ-deformed Gaussian. A possible interpretation of the deformation parameter κ is proposed.