Hausdorff Measure for a Stable-Like Process over an Infinite Extension of a Local Field

Details Hausdorff Measure for a Stable-Like Process over an Infinite Extension of a Local Field Hausdorff Measure for a Stable-Like Process over an Infinite Extension of a Local Field

2001-07-21

arxiv.org/abs/math/0107156v2

Mathematics

Probability

The final version, to appear in Journal of Theoretical Probability

Scientific paper

We consider an infinite extension $K$ of a local field of zero characteristic which is a union of an increasing sequence of finite extensions. $K$ is equipped with an inductive limit topology; its conjugate $\bar{K}$ is a completion of $K$ with respect to a topology given by certain explicitly written seminorms. The semigroup of measures, which defines a stable-like process $X(t)$ on $\bar{K}$, is concentrated on a compact subgroup $S\subset \bar{K}$. We study properties of the process $X_S(t)$, a part of $X(t)$ in $S$. It is shown that the Hausdorff and packing dimensions of the image of an interval equal 0 almost surely. In the case of tamely ramified extensions a correct Hausdorff measure for this set is found.

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