# Publications of the Research Institute for Mathematical Sciences

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**Volume 50, Issue 3, 2014, pp. 569–588**

**DOI: 10.4171/PRIMS/144**

Published online: 2014-09-17

Convergences and Projection Markov Property of Markov Processes on Ultrametric Spaces

Kohei Suzuki^{[1]}(1) Kyoto University, Japan

Let $(S,\rho)$ be an ultrametric space with certain conditions and $S^k$ be the quotient space of $S$ with respect to the partition by balls with a fixed radius $\phi(k)$. We prove that, for a Hunt process $X$ on $S$ associated with a Dirichlet form $(\mathcal E, \mathcal F)$, a Hunt process $X^k$ on $S^k$ associated with the averaged Dirichlet form $(\mathcal E^k, \mathcal F^k)$ is Mosco convergent to $X$, and under certain additional conditions, $X^k$ converges weakly to $X$. Moreover, we give a sufficient condition for the Markov property of $X$ to be preserved under the canonical projection $\pi^k$ to $S^k$. In this case, we see that the projected process $\pi^k\circ X$ is identical in law to $X^k$ and converges almost surely to $X$.

*Keywords: *ultrametric spaces, p-adic numbers, Markov processes, Mosco convergence, weak convergence, Dirichlet forms, Markov functions, projection Markov property

Suzuki Kohei: Convergences and Projection Markov Property of Markov Processes on Ultrametric Spaces. *Publ. Res. Inst. Math. Sci.* 50 (2014), 569-588. doi: 10.4171/PRIMS/144