Limit theorems for signatures

2023/06/23 by Kifer, Yuri · 1 citation
#60F15 #FOS: Mathematics #Probability (math.PR)

paper · doi:10.48550/arxiv.2306.13376

Abstract

We obtain strong moment invariance principles for normalized multiple iterated sums and integrals of the form \mathbbS^(ν)(t)=N^-ν/2∑_0≤ k₁<...0 in the Prokhorov and the Wasserstein metrics to the distribution of certain stochastic processes \mathbbW_N^(ν) constructed recursively starting from W_N=\mathbbW_N⁽¹⁾ which is a Brownian motion with covariances. This is done by constructing a coupling between \mathbbS_N⁽¹⁾ and \mathbbW_N⁽¹⁾, estimating directly the moment variational norm of \mathbbS_N^(ν)-\mathbbW_N^(ν) for ν=1,2 and extending these estimates to ν>2 relying partially on arguments borrowed from the rough paths theory. In the continuous time we work both under direct weak dependence assumptions and also within the suspension setup which is more appropriate for applications in dynamical systems.

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• Large Deviations for Iterated Sums and Integrals

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