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arXiv 2005.01551math.AP
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无穷大Laplacian的反应扩散方程

Reaction-diffusion equations for the infinity Laplacian

Nicolau M. L. Diehl, Rafayel Teymurazyan

摘要:

当右端不变号且满足一定的增长条件时,得到了非齐次无穷Laplace方程在自由边界上的黏性解的强正则性.我们证明几何正则性估计的解决方案,并得出结论,一旦源项是可比的齐次函数,那么自由边界是一个多孔集,因此,有零勒贝格测度。此外,我们还得到了一个Liouville型定理。当在原点附近的右手边的增长不快于三次齐次函数,我们表明,如果一个非负的黏性解在一个点消失,那么它必须为零无处不在。

英文摘要:

We derive sharp regularity for viscosity solutions of an inhomogeneous infinity Laplace equation across the free boundary, when the right hand side does not change sign and satisfies a certain growth condition. We prove geometric regularity estimates for solutions and conclude that once the source term is comparable to a homogeneous function, then the free boundary is a porous set and hence, has zero Lebesgue measure. Additionally, we derive a Liouville type theorem. When near the origin the right hand side grows not faster than third degree homogeneous function, we show that if a non-negative viscosity solution vanishes at a point, then it has to vanish everywhere.

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