In this work, we show that uniform integrability is not a necessary condition for central limit theorems (CLT) to hold for normalized multilevel Monte Carlo MLMC estimators, and we provide near optimal weaker conditions under which the CLT is achieved. In particular, if the variance decay rate dominates the computational cost rate (i.e., ), we prove that the CLT always holds.
Sebastian Krumscheid, Hakon Andreas Hoel
Fabio Nobile, Juan Pablo Madrigal Cianci