Mathematics – Probability
Scientific paper
2007-06-19
Stochastic Processes and their Applications 118 (2008) 2344-2368
Mathematics
Probability
to appear in: Stochastic Processes and Their Applications
Scientific paper
10.1016/j.spa.2008.01.005
We obtain several extensions of Talagrand's lower bound for the small deviation probability using metric entropy. For Gaussian processes, our investigations are focused on processes with sub-polynomial and, respectively, exponential behaviour of covering numbers. The corresponding results are also proved for non-Gaussian symmetric stable processes, both for the cases of critically small and critically large entropy. The results extensively use the classical chaining technique; at the same time they are meant to explore the limits of this method.
Aurzada Frank
Lifshits Mikhail
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