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On the role of the chaotic velocity in relativistic kinetic theory

机译:关于混沌速度在相对论动力学理论中的作用

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In this paper we revisit the concept of chaotic velocity within the context of relativistic kinetic theory. Its importance as the key ingredient which allows to clearly distinguish convective and dissipative effects is discussed to some detail. Also, by addressing the case of the two component mixture, the relevance of the barycentric comoving frame is established and thus the convenience for the introduction of peculiar velocities for each species. The fact that the decomposition of molecular velocity in systematic and peculiar components does not alter the covariance of the theory is emphasized. Moreover, we show that within an equivalent decomposition into space-like and time-like tensors, based on a generalization of the relative velocity concept, the Lorentz factor for the chaotic velocity can be expressed explicitly as an invariant quantity. This idea, based on Ellis' theorem, allows to foresee a natural generalization to the general relativistic case.
机译:在本文中,我们在相对论动力学理论的背景下重新审视混沌速度的概念。其重要性作为允许明确区​​分对流和耗散效应的关键成分进行了一些细节。而且,通过解决两个组分混合物的情况,建立了双重COMOVING框架的相关性,因此为每个物种引入特殊速度的便利性。系统和特殊组分中分子速度分解的事实不会改变理论的协方差。此外,我们表明,基于相对速度概念的概念,在等效分解到时空和时间状张量内,可以将混沌速度的洛伦兹因子明确地作为不变的数量表示。基于Ellis'定理的这个想法允许预先预见到一般相对论案例的自然概括。

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