Skorokhod embeddings, minimality and non-centred target distributions

Details Skorokhod embeddings, minimality and non-centred target distributions Skorokhod embeddings, minimality and non-centred target distributions

2003-10-27

arxiv.org/abs/math/0310403v2

Mathematics

Probability

20 pages, 2 figures; Main theorem extended, other content streamlined

Scientific paper

In this paper we consider the Skorokhod embedding problem for target distributions with non-zero mean. In the zero-mean case, uniform integrability provides a natural restriction on the class of embeddings, but this is no longer suitable when the target distribution is not centred. Instead we restrict our class of stopping times to those which are minimal, and we find conditions on the stopping times which are equivalent to minimality. We then apply these results, firstly to the problem of embedding non-centred target distributions in Brownian motion, and secondly to embedding general target laws in a diffusion. We construct an embedding (which reduces to the Azema-Yor embedding in the zero-target mean case) which maximises the law of \sup_{s \le T} B_s among the class of minimal embeddings of a general target distribution \mu in Brownian motion. We then construct a minimal embedding of \mu in a diffusion X which maximises the law of \sup_{s \le T} h(X_s) for a general function h.

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