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arXiv 1302.0949math.AP
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奇异测度作为某些非局部算子的主本征函数

Singular measure as principal eigenfunction of some nonlocal operators

Jerome Coville

摘要:

本文研究了一类非局部算子广义主特征值的谱性质。也就是说,我们寻找一个非局部算子的某个特殊解$(λ,ϕ)$的存在性。$$\int_ØK(x,y)ϕ(y)\, dy +a(x)ϕ(x) =-λϕ(x),$$其中$Ø\subset\R^n$是开有界连通集,$K$是非负核,并且$a$是连续的。证明了在符号测度空间中,对于广义主特征值$λ_p:=\sup \{λ\in \R \, |\, \exists \, ϕ\in C(Ø), ϕ> 0 \;\text{so that}\; \oplbϕØ+ a(x)ϕ+ λϕ\le 0\}$,问题总存在解$(μ, λ_p)$.此外,$μ$是一种积极的措施。当$μ$关于勒贝格测度绝对连续时,$μ=ϕ_p(x)$称为与$λ_p$相关的主本征函数。在一些简单的情况下,我们展示了一些显式的奇异措施,是解决方案的谱问题。

英文摘要:

In this paper, we are interested in the spectral properties of the generalised principal eigenvalue of some nonlocal operator. That is, we look for the existence of some particular solution $(λ,ϕ)$ of a nonlocal operator. $$\int_ØK(x,y)ϕ(y)\, dy +a(x)ϕ(x) =-λϕ(x),$$ where $Ø\subset\R^n$ is an open bounded connected set, $K$ a nonnegative kernel and $a$ is continuous. We prove that for the generalised principal eigenvalue $λ_p:=\sup \{λ\in \R \, |\, \exists \, ϕ\in C(Ø), ϕ> 0 \;\text{so that}\; \oplbϕØ+ a(x)ϕ+ λϕ\le 0\}$ there exists always a solution $(μ, λ_p)$ of the problem in the space of signed measure. Moreover $μ$ a positive measure. When $μ$ is absolutely continuous with respect to the Lebesgue measure, $μ=ϕ_p(x)$ is called the principal eigenfunction associated to $λ_p$. In some simple cases, we exhibit some explicit singular measures that are solutions of the spectral problem.

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