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arXiv 1111.6335math.APmath-phmath.MP
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Vlasov-Poisson-Boltzmann系统的衰变

Decay of the Vlasov-Poisson-Boltzmann system

Yanjin Wang

摘要:

利用精细纯能量方法,建立了两种群Vlasov-Poisson-Boltzmann系统在Maxwell附近Cauchy问题解的时间衰减率。负的Sobolev范数被证明是保存沿时间的演变,并提高衰减率。两种粒子的总密度以Boltzmann方程的最佳代数速率衰减,但两种粒子之间的差异和电场以指数速率衰减。这种现象揭示了本质的区别时,相比之下,一个物种的弗拉索夫-泊松-玻尔兹曼系统中的电场衰减在最佳的代数率或弗拉索夫-玻尔兹曼系统中,两个物种之间的差距衰减在最佳的代数率。我们的证明是基于一个家庭的规模的能源估计与最小的衍生计数和插值之间没有线性衰减分析,以及重新制定的问题,以及显示取消属性的两个物种的系统。

英文摘要:

We establish the time decay rates of the solutions to the Cauchy problem for the two-species Vlasov-Poisson-Boltzmann system near Maxwellians via a refined pure energy method. The negative Sobolev norms are shown to be preserved along time evolution and enhance the decay rates. The total density of two species of particles decays at the optimal algebraic rate as the Boltzmann equation, but the disparity between two species and the electric field decay at an exponential rate. This phenomenon reveals the essential difference when compared to the one-species Vlasov-Poisson-Boltzmann system in which the electric field decays at the optimal algebraic rate or the Vlasov-Boltzmann system in which the disparity between two species decays at the optimal algebraic rate. Our proof is based on a family of scaled energy estimates with minimum derivative counts and interpolations among them without linear decay analysis, and a reformulation of the problem which well displays the cancelation property of the two-species system.

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