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arXiv 0904.4459math.APmath-phmath.MP
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玻尔兹曼方程的声学极限:经典解

Acoustic limit of the Boltzmann equation: classical solutions

Juhi Jang, Ning Jiang

摘要:

我们在经典解的框架下研究了玻尔兹曼方程的声学极限。对于重新标度的Boltzmann方程的解$F_\varepsilon=μ+\varepsilon \sqrtμf_\varepsilon$在声学时间标度\partial_t F_ \varepsilon + \vgrad F_ \varepsilon = \frac{1}{\varepsilon} \Q(F_ \varepsilon,F_ \varepsilon)中,在周期盒$\mathbb{T}^3$中,我们建立了$f_\varepsilon$在$\varepsilon$中的全局时间均匀能量估计,并证明了$f_\varepsilon$强收敛于其动力学由声学系统控制的$f$.碰撞核$\Q$包括硬球相互作用和具有角截止的逆幂律。

英文摘要:

We study the acoustic limit from the Boltzmann equation in the framework of classical solutions. For a solution $F_\varepsilon=μ+\varepsilon \sqrtμf_\varepsilon$ to the rescaled Boltzmann equation in the acoustic time scaling \partial_t F_\varepsilon +\vgrad F_\varepsilon =\frac{1}{\varepsilon} \Q(F_\varepsilon,F_\varepsilon), inside a periodic box $\mathbb{T}^3$, we establish the global-in-time uniform energy estimates of $f_\varepsilon$ in $\varepsilon$ and prove that $f_\varepsilon$ converges strongly to $f$ whose dynamics is governed by the acoustic system. The collision kernel $\Q$ includes hard-sphere interaction and inverse-power law with an angular cutoff.

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