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arXiv 2102.02587math.AP
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透明介质中的非线性扩散

Nonlinear diffusion in transparent media

Lorenzo Giacomelli, Salvador Moll, Francesco Petitta

摘要:

我们考虑一个典型的非线性抛物型方程,它的通量具有三个显著的特征:它是关于未知量和梯度的非线性的,它是齐次的,它只依赖于梯度的方向.对于这类方程,我们得到了狄利克雷问题、齐次Neumann问题和Cauchy问题熵解的存在唯一性.定性性质的解决方案,如有限的传播速度和发生的等待时间的现象,与尖锐的界限,显示。我们还讨论了跳跃间断的形成都在边界处的解决方案的支持和散装。

英文摘要:

We consider a prototypical nonlinear parabolic equation whose flux has three distinguished features: it is nonlinear with respect to both the unknown and its gradient, it is homogeneous, and it depends only on the direction of the gradient. For such equation, we obtain existence and uniqueness of entropy solutions to the Dirichlet problem, the homogeneous Neumann problem, and the Cauchy problem. Qualitative properties of solutions, such as finite speed of propagation and the occurrence of waiting-time phenomena, with sharp bounds, are shown. We also discuss the formation of jump discontinuities both at the boundary of the solutions' support and in the bulk.

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。

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