Quasi-sure Stochastic Analysis through Aggregation

Details Quasi-sure Stochastic Analysis through Aggregation Quasi-sure Stochastic Analysis through Aggregation

2010-03-23

arxiv.org/abs/1003.4431v2

Electronic Journal of Probability, Vol. 16, 1844-1879, Article Number 67 (2011)

Mathematics

Probability

38 pages

Scientific paper

This paper is on developing stochastic analysis simultaneously under a general family of probability measures that are not dominated by a single probability measure. The interest in this question originates from the probabilistic representations of fully nonlinear partial differential equations and applications to mathematical finance. The existing literature relies either on the capacity theory (by Denis and Martini), or on the underlying nonlinear partial differential equation (by Peng). In both approaches, the resulting theory requires the smoothness of the corresponding processes and random variables in terms of the underlying canonical process. In this paper, we investigate this question for a larger class of "non-smooth" processes, but with a restricted family of non-dominated probability measures. For smooth processes, our approach leads to similar results as in previous literature, provided the restricted family satisfies an additional density property.

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