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arXiv 0801.2299cond-mat.stat-mech
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湮灭动力学I:线性化玻尔兹曼方程和流体力学

Dynamics of Annihilation I : Linearized Boltzmann Equation and Hydrodynamics

M. I. Garcia de Soria, P. Maynar, G. Schehr, A. Barrat, E. Trizac

摘要:

我们研究了自由运动粒子系统的非平衡统计力学,在该系统中,二元碰撞要么导致弹性碰撞,要么导致对的消失。因此,这种{ \em弹道湮灭}系统不断地释放粒子。从线性化玻尔兹曼算子的谱特性研究了自由衰变区周围扰动的动力学,该算子表征了所有时间尺度上的线性激发。线性化玻尔兹曼方程求解的流体动力学限制的投影技术,从而产生的相关粗粒场的演化方程和表达式的输运系数。最后,我们提出的分子动力学模拟的结果,验证了理论预测。

英文摘要:

We study the non-equilibrium statistical mechanics of a system of freely moving particles, in which binary encounters lead either to an elastic collision or to the disappearance of the pair. Such a system of {\em ballistic annihilation} therefore constantly looses particles. The dynamics of perturbations around the free decay regime is investigated from the spectral properties of the linearized Boltzmann operator, that characterize linear excitations on all time scales. The linearized Boltzmann equation is solved in the hydrodynamic limit by a projection technique, which yields the evolution equations for the relevant coarse-grained fields and expressions for the transport coefficients. We finally present the results of Molecular Dynamics simulations that validate the theoretical predictions.

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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