α-Continuity Properties of Stable Processes

Details α-Continuity Properties of Stable Processes α-Continuity Properties of Stable Processes

2004-07-19

arxiv.org/abs/math/0407318v1

Mathematics

Probability

22 pages

Scientific paper

Let $D$ be a domain of finite Lebesgue measure in $\bR^d$ and let $X^D_t$ be the symmetric $\alpha$-stable process killed upon exiting $D$. Each element of the set $\{\lambda_i^\alpha\}_{i=1}^\infty$ of eigenvalues associated to $X^D_t$, regarded as a function of $\alpha\in(0,2)$, is right continuous. In addition, if $D$ is Lipschitz and bounded, then each $ \lambda_i^\alpha$ is continuous in $\alpha$ and the set of associated eigenfunctions is precompact. We also prove that if $D$ is a domain of finite Lebesgue measure, then for all $0<\alpha<\beta\leq 2$ and $i\geq 1$, \[\lambda_i^\alpha \leq [ \lambda^\beta_i]^{\alpha/\beta}.\] Previously, this bound had been known only for $\beta=2$ and $\alpha$ rational.

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