arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2104.10053math.AP
收藏

具有软势的Boltzmann方程的大振幅解

The large amplitude solution of the Boltzmann equation with soft potential

Gyounghun Ko, Donghyun Lee, Kwanghyuk Park

摘要:

本文研究了具有软势的(角截止)Boltzmann方程($-3<γ<0$)。特别地,我们构造了一个唯一的全局解$L^\infty_{x,v}$,它渐近收敛到全局平衡,提供了初始数据有一个大的振幅,但具有足够小的相对熵。由于频率乘子不再是一致正的,与硬势情况不同,包含时间的速度权重将用于导出解的次指数衰减。受最近$L^2\mbox{-}L^\infty$方法发展的启发,我们还介绍了二次非线性项的一些修正估计。线性化碰撞核将被巧妙地处理,以控制软势核的奇异性。

英文摘要:

In this paper, we deal with (angular cut-off) Boltzmann equation with soft potential ($-3<γ<0$). In particular, we construct a unique global solution in $L^\infty_{x,v}$ which converges to global equilibrium asymptotically provided that initial data has a large amplitude but with sufficiently small relative entropy. Because frequency multiplier is not uniformly positive anymore, unlike hard potential case, time-involved velocity weight will be used to derive sub-exponential decay of the solution. Motivated by recent development of $L^2\mbox{-}L^\infty$ approach also, we introduce some modified estimates of quadratic nonlinear terms. Linearized collision kernel will be treated in a subtle manner to control singularity of soft potential kernel.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑