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arXiv 1202.0706math.PR
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从属布朗运动的Harnack不等式

Harnack Inequalities for Subordinate Brownian Motions

Panki Kim, Ante Mimica

摘要:

本文考虑R^d,d \geq 1中的瞬态从属布朗运动X,其中相应从属子的Laplace指数满足一些较弱的条件.对X证明了尺度不变的Harnack不等式.我们首先给出新形式的渐近性质的Levy和潜在的密度的从属零附近。利用这些结果,我们找到了原点附近X的Levy密度和势密度的渐进性,这对我们的方法至关重要。我们的结果所涵盖的例子包括几何稳定过程和相对论性几何稳定过程,即当从属子的Laplace指数为\log(1+λ^{α/2})(0<α \leq 2,d > α)和\log(1+(λ+m^{α/2})^{2/α}-m)(0<α<2,\,m>0,d >2)时的情形.

英文摘要:

In this paper, we consider transient subordinate Brownian motion X in R^d, d \geq 1, where the Laplace exponent ϕof the corresponding subordinator satisfies some mild conditions. The scaleinvariant Harnack inequality is proved for X. We first give new forms of asymptotical properties of the Levy and potential density of the subordinator near zero. Using these results we find asymptotics of the Levy density and potential density of X near the origin, which is essential to our approach. The examples which are covered by our results include geometric stable processes and relativistic geometric stable processes, i.e. the cases when the subordinator has the Laplace exponent ϕ(λ)=\log(1+λ^{α/2}) (0<α\leq 2, d > α) and ϕ(λ)=\log(1+(λ+m^{α/2})^{2/α}-m) (0<α<2,\,m>0,d >2).

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