Small deviations in $p$-variation for multidimensional Lévy processes
Simon, Thomas
J. Math. Kyoto Univ., Tome 43 (2003) no. 4, p. 523-565 / Harvested from Project Euclid
Let $Z$ be an $\mathbb{R}^{d}$-valued Lévy process with strong finite $p$-variation for some $p < 2$. We prove that the “decompensated” process $\Tilde{Z}$ obtained from $Z$ by annihilating its generalized drift has a small deviations property in $p$-variation. This property means that the null function belongs to the support of the law of $\Tilde{Z}$ with respect to the $p$-variation distance. Thanks to the continuity results of T. J. Lyons/D. R. E. Williams [19], [35], this allows us to prove a support theorem with respect to the $p$-Skorohod distance for canonical SDE’s driven by $Z$ without any assumption on $Z$, improving the results of H. Kunita [15]. We also give a criterion ensuring the small deviation property for $Z$ itself, noticing that the characterization under the uniform distance, which we had obtained in [26], no more holds under the $p$-variation distance.
Publié le : 2003-05-15
Classification:  60G51,  60H10
@article{1250283694,
     author = {Simon, Thomas},
     title = {Small deviations in $p$-variation for multidimensional L\'evy processes},
     journal = {J. Math. Kyoto Univ.},
     volume = {43},
     number = {4},
     year = {2003},
     pages = { 523-565},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1250283694}
}
Simon, Thomas. Small deviations in $p$-variation for multidimensional Lévy processes. J. Math. Kyoto Univ., Tome 43 (2003) no. 4, pp.  523-565. http://gdmltest.u-ga.fr/item/1250283694/