论文标题
粗粒系统的动量波动
Momentum fluctuations in coarse grained systems
论文作者
论文摘要
乍一看，质量和动量的定义似乎是唯一定义的。但是，我们在这里表明，这种确定性可能会误导许多粗砂系统。我们表明，特别是在晶格气体和晶格玻尔兹曼（Boltzmann）（晶格气体和格子）方法中，动量的共同定义的波动性质不同意动量的基本定义。在晶格气体的情况下，动量的定义甚至会在大波长的极限上不同意。在短时间内，我们可以提供分析不同动量度量的分析表示，从而全面说明这些差异。
At first glance the definition of mass and momentum appears to be uniquely defined. We show here, however, that this certainty can be misleading for many coarse grained systems. We show that particularly the fluctuating properties of common definitions of momentum in coarse grained methods like lattice gas and lattice Boltzmann do not agree with a fundamental definition of momentum. In the case of lattice gases, the definition of momentum will even disagree in the limit of large wavelength. For short times we can give analytical representations for the distribution of different momentum measures and thereby give a full account of these differences.
