arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2108.12970math.AP
收藏

具有部分数据和可能奇异吸收项的多孔介质方程的反问题

An inverse problem for the porous medium equation with partial data and a possibly singular absorption term

Cătălin I. Cârstea, Tuhin Ghosh, Gunther Uhlmann

摘要:

本文证明了空间维数为2或更高的含吸收项的多孔介质方程中三系数函数的反边值问题的唯一性,其中$m>1$,$m^{-1}<q<\sqrt{m}$为$ε\partial_t u-\nabla\cdot(γ\nabla u^m)+λu^q=0$.这是一个退化的抛物型准线性偏微分方程,它已被用来作为一个模型的现象,如气体流动(通过多孔介质),等离子体物理学和人口动力学领域。当$γ=1$先验的情况下,我们证明了唯一的可识别性与数据支持在一个任意小的部分的边界。即使是全球性的问题,我们改善了以前的工作,通过获得一个有限的(而不是无限的)观察时间的唯一性,也通过引入额外的吸收项$λu^q$。

英文摘要:

In this paper we prove uniqueness in the inverse boundary value problem for the three coefficient functions in the porous medium equation with an absorption term $ε\partial_t u-\nabla\cdot(γ\nabla u^m)+λu^q=0$, with $m>1$, $m^{-1}<q<\sqrt{m}$, with the space dimension 2 or higher. This is a degenerate parabolic type quasilinear PDE which has been used as a model for phenomena in fields such as gas flow (through a porous medium), plasma physics, and population dynamics. In the case when $γ=1$ a priori, we prove unique identifiability with data supported in an arbitrarily small part of the boundary. Even for the global problem we improve on previous work by obtaining uniqueness with a finite (rather than infinite) time of observation and also by introducing the additional absorption term $λu^q$.

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。

↑