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arXiv 2006.03579math.AP
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Schwarzschild时空中无质量Vlasov方程的衰减估计

Decay estimates for the massless Vlasov equation on Schwarzschild spacetimes

University of Cambridge(剑桥大学)

Léo Bigorgne

AI总结:

通过推广Dafermos-Rodnianski的r^p加权能量方法,证明Schwarzschild黑洞外区域无质量Vlasov场非退化能量通量的任意衰减,并利用红移效应和光子球附近的捕获现象得到速度平均的点态衰减。

摘要:

我们考虑Schwarzschild黑洞外通信区域中无质量Vlasov方程的解。通过推广Dafermos和Rodnianski广泛用于研究波动方程的r^p加权能量方法,我们证明了通过精心选择的叶状结构,Vlasov场f的非退化能量通量具有任意衰减。该方法的一个关键步骤是证明非退化的积分局部能量衰减。为此,我们特别利用了事件视界附近的红移效应。然而,光子球处的捕获需要在速度变量中损失一个epsilon的可积性。然后通过适用于Vlasov场研究的泛函不等式获得f的速度平均的点态衰减估计,这些不等式使我们能够处理径向导数缺乏守恒律的问题。

英文摘要:

We consider solutions to the massless Vlasov equation on the domain of outer communications of the Schwarschild black hole. By adapting the r^p-weighted energy method of Dafermos and Rodnianski, used extensively in order to study wave equations, we prove arbitrary decay for a non-degenerate energy flux of the Vlasov field f through a well-chosen foliation. An essential step of this methodology consists in proving a non-degenerate integrated local energy decay. For this, we take in particular advantage of the red-shift effect near the event horizon. The trapping at the photon sphere requires however to lose an epsilon of integrability in the velocity variable. Pointwise decay estimates on the velocity average of f are then obtained by functional inequalities, adapted to the study of Vlasov fields, which allow us to deal with the lack of conservation law for the radial derivative.

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