Burkholder inequalities for submartingales, Bessel processes and conformal martingales

Details Burkholder inequalities for submartingales, Bessel processes and conformal martingales Burkholder inequalities for submartingales, Bessel processes and conformal martingales

2011-12-02

arxiv.org/abs/1112.0551v1

Mathematics

Probability

Scientific paper

The motivation for this paper comes from the following question on comparison of norms of conformal martingales $X$, $Y$ in $\R^d$, $d\geq 2$. Suppose that $Y$ is differentially subordinate to $X$. For $01$ is not an integer, which has further interesting applications to stopped Bessel processes and to the behavior of smooth functions on Euclidean domains. The inequality for conformal martingales, which has its roots on the study of the $L^p$ norms of the Beurling-Ahlfors singular integral operator \cite{BW}, extends a recent result of Borichev, Janakiraman and Volberg \cite{BJV2}.

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