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arXiv 1908.09665cond-mat.stat-mechastro-ph.HEastro-ph.SR
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关于运动论中熵力与黑洞的注记

A Note on the Entropy Force in Kinetic Theory and Black Holes

R. A. Treumann, Wolfgang Baumjohann

摘要:

熵力是统计多粒子系统中无序不均匀性的集体效应。我们证明了它对一个特定的天体,黑洞的可能影响。然后,我们推导出包含熵力的大质点系的动力学方程。它增加了一个集体,因此积分项Klimontovich方程的演变的单粒子分布函数。它的积分性质将基本的单粒子动力学方程转化为已经在基本水平上的积分-微分方程,表明不仅微观力而且空穴系统以整体方式对其概率分布的演变做出反应。它还引起无碰撞耗散项,但该项在粒子数倒数中很小,因此可以忽略不计。然而,它提供了一个熵的碰撞耗散项。后者是通过粒子关联定义的,但没有任何奇点,因此是大尺度的。它还允许在相空间中的熵密度的动力学方程的推导。这与相空间密度方程的结构相同。熵密度通过积分熵力整体地确定自身,从而提供熵在相空间中的自控演化。

英文摘要:

The entropy force is the collective effect of inhomogeneity in disorder in a statistical many particle system. We demonstrate its presumable effect on one particular astrophysical object, the black hole. We then derive the kinetic equations of a large system of particles including the entropy force. It adds a collective therefore integral term to the Klimontovich equation for the evolution of the one-particle distribution function. Its integral character transforms the basic one particle kinetic equation into an integro-differential equation already on the elementary level, showing that not only the microscopic forces but the hole system reacts to its evolution of its probability distribution in a holistic way. It also causes a collisionless dissipative term which however is small in the inverse particle number and thus negligible. However it contributes an entropic collisional dissipation term. The latter is defined via the particle correlations but lacks any singularities and thus is large scale. It allows also for the derivation of a kinetic equation for the entropy density in phase space. This turns out to be of same structure as the equation for the phase space density. The entropy density determines itself holistically via the integral entropy force thus providing a self-controlled evolution of entropy in phase space.

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