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arXiv 1111.4114math.AP
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非局部扩散问题的第一类eigenvalue的上界

Lower and upper bounds for the first eigenvalue of nonlocal diffusion problems in the whole space

L. I. Ignat, J. D. Rossi, A. San Antolin

摘要:

我们发现下和上界的形式$ T(u) = - \int_{\rr^d} K(x,y) (u(y)-u(x)) \, dy$的非局部扩散算子的第一特征值。在这里,我们考虑一个内核$K(x,y)=ψ(y-a(x))+ψ(x-a(y))$,其中$ψ$是一个有界的,非负的功能支持的单位球和$a$意味着一个同构的$\rr^d$。一个简单的例子是线性函数$a(x)= Ax$。我们得到的上界和下界是根据$a$的雅可比矩阵和$ψ$的积分给出的。实际上,在线性情况下,$a(x) = Ax$,我们得到了一个明确的表达式,第一个特征值在整个$\rr^d$和它是积极的,当矩阵$A$的行列式是不相同的。作为我们的结果的应用,我们观察到,当第一特征值是积极的,有一个指数衰减的解决方案,相关的发展问题。作为得到这一结果的工具,我们还研究了非局部Dirichlet问题的主特征值在球$B_R$中的行为,证明了它在整个空间中以$R\to \infty$收敛于第一特征值.

英文摘要:

We find lower and upper bounds for the first eigenvalue of a nonlocal diffusion operator of the form $ T(u) = - \int_{\rr^d} K(x,y) (u(y)-u(x)) \, dy$. Here we consider a kernel $K(x,y)=ψ(y-a(x))+ψ(x-a(y))$ where $ψ$ is a bounded, nonnegative function supported in the unit ball and $a$ means a diffeomorphism on $\rr^d$. A simple example being a linear function $a(x)= Ax$. The upper and lower bounds that we obtain are given in terms of the Jacobian of $a$ and the integral of $ψ$. Indeed, in the linear case $a(x) = Ax$ we obtain an explicit expression for the first eigenvalue in the whole $\rr^d$ and it is positive when the the determinant of the matrix $A$ is different from one. As an application of our results, we observe that, when the first eigenvalue is positive, there is an exponential decay for the solutions to the associated evolution problem. As a tool to obtain the result, we also study the behaviour of the principal eigenvalue of the nonlocal Dirichlet problem in the ball $B_R$ and prove that it converges to the first eigenvalue in the whole space as $R\to \infty$.

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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