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arXiv 2303.10652math.AP
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分数阶Rayleigh-斯托克斯方程的一个非局部问题

A non-local problem for the fractional order Rayleigh-Stokes equation

Ravshan Ashurov, Oqila Mukhiddinova, Sabir Umarov

摘要:

研究了流体力学中著名的分数阶Rayleigh-斯托克斯方程的非局部边值问题。即,提出条件$u(x,T)=βu(x,0)+φ(x)$来代替初始条件,其中$β$是任意实数。如果是$β=0$,那么我们得到时间上的逆问题,称为倒推问题。众所周知,后向问题在Hadamard意义下是不适定的。如果是$β=1$,则相应的非局部问题在Hadamard意义下是适定的,而且,在这种情况下,可以建立解的强制估计。这项工作的目的是找到参数$β$的值,它分离两种类型的行为的半落后的问题正在考虑中。我们证明了以下陈述:如果$β\ge 1,$或$β<0$,那么问题是适定的;如果$β\in (0,1)$,那么取决于椭圆方程部分的特征值,对于解的存在性,可能会出现关于方程右侧和边界函数与相应椭圆算子的一些特征函数正交的附加条件。

英文摘要:

A nonlocal boundary value problem for the fractional version of the well known in fluid dynamics Rayleigh-Stokes equation is studied. Namely, the condition $u(x,T)=βu(x,0)+φ(x)$, where $β$ is an arbitrary real number, is proposed instead of the initial condition. If $β=0$, then we get the inverse problem in time, called the backward problem. It is well known that the backward problem is ill-posed in the sense of Hadamard. If $β=1$, then the corresponding non-local problem becomes well-posed in the sense of Hadamard, and moreover, in this case a coercive estimate for the solution can be established. The aim of this work is to find values of the parameter $β$, which separates two types of behavior of the semi-backward problem under consideration. We prove the following statements: if $β\ge 1,$ or $β<0$, then the problem is well-posed; if $β\in (0,1)$, then depending on the eigenvalues of the elliptic part of the equation, for the existence of a solution an additional condition on orthogonality of the right-hand side of the equation and the boundary function to some eigenfunctions of the corresponding elliptic operator may emerge.

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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