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arXiv 1001.0636math.APmath-phmath.MP
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具有稳定空间渐近性的径向Vlasov-Poisson系统的整体存在性和空间增长衰减性

Global Existence and Increased Spatial Decay for the Radial Vlasov-Poisson System with Steady Spatial Asymptotics

Stephen Pankavich

摘要:

在三维空间中,用Vlasov-Poisson系统模拟无碰撞等离子体。假定正电荷的背景是固定的,与时间和空间无关。考虑了当x趋于无穷大时,可动负离子平衡正电荷的情况。因此,总的正电荷、总的负电荷和总的能量都是无穷大的。光滑的解决方案与适当的渐近行为大的x,这是以前所示的存在于当地的时间,继续全球球对称数据。这是通过证明电荷密度的衰减至少与x^{-4}一样快来实现的。最后,在没有球对称假设的一般情况下,x^{-6}的衰减率增加。

英文摘要:

A collisionless plasma is modeled by the Vlasov-Poisson system in three space dimensions. A fixed background of positive charge, which is independent of time and space, is assumed. The situation in which mobile negative ions balance the positive charge as x tends to infinity is considered. Hence the total positive charge, total negative charge, and total energy are all infinite. Smooth solutions with appropriate asymptotic behavior for large x, which were previously shown to exist locally in time, are continued globally for spherically symmetric data. This is done by showing that the charge density decays at least as fast as x^{-4}. Finally, an increased decay rate of x^{-6} is shown in the general case without the assumption of spherical symmetry.

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