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arXiv 1601.01243math.AP
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关于Boltzmann方程的整体正则解分支和多重解

On global regular solution branches and multiple solutions of the Boltzmann equation

Jörg Kampen

摘要:

证明了相空间维数为$2d\geq 6$且在无穷远阶多项式衰减大于$2d$的连续可微BoltzmannCauchy问题的整体正则解分支的存在性.这类数据有关于高斯的无限相对熵。此外,在空间维度$d\geq 3$中存在Boltzmann方程的弱奇异解分支,即,Boltzmann方程的解,这些解关于相空间中某点的速度变量仅为Lipschitz。这与a.e.一致。$L^1$ -重整化解的唯一性(参见\cite{L})和混合正则性的函数空间中更经典的结果。

英文摘要:

Existence of global regular solution branches of the Boltzmann Cauchy problem with continuously differentiable data in phase space dimension $2d\geq 6$ with polynomial decay at infinity of order greater than $2d$ is proved. There are data in this class of infinite relative entropy with respect to the Gaussian. Furthermore, there are weakly singular solution branches of the Boltzmann equation in spatial dimension $d\geq 3$, i.e., solutions of the Boltzmann equations which are only Lipschitz with respect to the velocity variables at some point in phase space. This is in accordance with a.e. $L^1$-uniqueness of renormalized solutions (cf.\cite{L}) and more classical results in function spaces of mixed regularity.

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