p-variation of strong Markov processes

Details p-variation of strong Markov processes p-variation of strong Markov processes

2004-10-05

arxiv.org/abs/math/0410106v1

Annals of Probability 2004, Vol. 32, No. 3A, 2053-2066

Mathematics

Probability

Published by the Institute of Mathematical Statistics (http://www.imstat.org) in the Annals of Probability (http://www.imsta

Scientific paper

10.1214/009117904000000423

Let \xi_t, t\in[0,T], be a strong Markov process with values in a complete separable metric space (X,\rho) and with transition probability function P_{s,t}(x,dy), 0\le s\le t\le T, x\in X. For any h\in[0,T] and a>0, consider the function \alpha(h,a)=sup\bigl{P_{s,t}\bigl(x,{y:\rho(x,y)\ge a}\bigr):x\in X,0\le s\le t\le (s+h)\wedge T\bigr}. It is shown that a certain growth condition on \alpha(h,a), as a\downarrow0 and h stays fixed, implies the almost sure boundedness of the p-variation of \xi_t, where p depends on the rate of growth.

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