arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2209.09340math.AP
收藏

线性动力学理论中的定量几何控制

Quantitative Geometric Control in Linear Kinetic Theory

Helge Dietert, Frédéric Hérau, Harsha Hutridurga, Clément Mouhot

摘要:

我们考虑一般的线性动力学方程相结合的运输和线性碰撞的动力学变量与空间的重量,可以消失的部分域。所考虑的输运算子包括外部势力和边界条件,例如镜面反射、扩散和麦克斯韦条件。所考虑的碰撞算子包括线性弛豫(散射)和Fokker-Planck算子,边界条件包括镜面反射、扩散和Maxwell条件。我们证明了定量估计的指数稳定(光谱间隙)的几何控制条件下。该论点是新的,完全依赖于轨道和加权函数不等式的发散算子。后面的函数不等式是独立的,并且隐含着定量加权的斯托克斯和科恩不等式。最后,我们表明,一致的控制条件并不总是必要的存在的谱间隙时,方程是亚椭圆的,并证明在这种情况下较弱的控制条件。

英文摘要:

We consider general linear kinetic equations combining transport and a linear collision on the kinetic variable with a spatial weight that can vanish on part of the domain. The considered transport operators include external potential forces and boundary conditions, e.g. specular, diffusive and Maxwell conditions. The considered collision operators include the linear relaxation (scattering) and the Fokker-Planck operators and the boundary conditions include specular, diffusive and Maxwell conditions. We prove quantitative estimates of exponential stabilisation (spectral gap) under a geometric control condition. The argument is new and relies entirely on trajectories and weighted functional inequalities on the divergence operators. The latter functional inequalities are of independent interest and imply quantitatively weighted Stokes and Korn inequalities. We finally show that uniform control conditions are not always necessary for the existence of a spectral gap when the equation is hypoelliptic, and prove weaker control conditions in this case.

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。

↑