Skorokhod Embeddings via Stochastic Flows on the Space of Measures

Abstract

We present a new construction of a Skorohod embedding, namely, given a probability measure mu with zero expectation and finite variance, we construct an integrable stopping time T adapted to a filtration F_t, such that W_t has the law mu, where W_t is a standard Wiener process adapted to the same filtration. We find several sufficient conditions for the stopping time T to be bounded or to have a sub-exponential tail. In particular, our embedding seems rather natural for the case that mu is a log-concave measure and the tail behaviour of $T$ admits some tight bounds in that case. Our embedding admits the property that the stochastic measure-valued process {mu_t} (0<t<T), where mu_t is as the law of W_T conditioned on F_t, is a Markov process.