Mathematics – Probability
Scientific paper
2007-03-02
Mathematics
Probability
Scientific paper
We establish integral tests and laws of the iterated logarithm at 0 and at $+\infty$, for the upper envelope of positive self-similar Markov processes. Our arguments are based on the Lamperti representation, time reversal arguments and on the study of the upper envelope of their future infimum due to Pardo \cite{Pa}. These results extend integral test and laws of the iterated logarithm for Bessel processes due to Dvoretsky and Erd\"os \cite{de} and stable L\'evy processes conditioned to stay positive with no positive jumps due to Bertoin \cite{be1}.
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