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arXiv 0801.2491cond-mat.stat-mech
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湮灭动力学II:整体能量的涨落

Dynamics of Annihilation II: Fluctuations of Global Quantities

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

摘要:

我们发展了一个理论的波动和相关性的气体弹道湮没动力学下演变。从层次方程的微观密度在相空间中的演变,我们随后限制到一个政权的空间均匀性,并获得明确的预测的波动和时间相关的粒子总数,总的线性动量和总动能。这些量之间的互相关,以及工作。这些预测成功地测试对分子动力学和蒙特卡罗模拟。这提供了强有力的支持的理论方法,包括流体动力学处理的线性化玻尔兹曼算子的频谱。这篇文章是arXiv:0801.2299的姊妹篇,利用了那里报道的光谱分析。

英文摘要:

We develop a theory for fluctuations and correlations in a gas evolving under ballistic annihilation dynamics. Starting from the hierarchy of equations governing the evolution of microscopic densities in phase space, we subsequently restrict to a regime of spatial homogeneity, and obtain explicit predictions for the fluctuations and time correlation of the total number of particles, total linear momentum and total kinetic energy. Cross-correlations between these quantities are worked out as well. These predictions are successfully tested against Molecular Dynamics and Monte-Carlo simulations. This provides strong support for the theoretical approach developed, including the hydrodynamic treatment of the spectrum of the linearized Boltzmann operator. This article is a companion paper to arXiv:0801.2299 and makes use of the spectral analysis reported there.

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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