On Girsanov's transform for backward stochastic differential equations

Details On Girsanov's transform for backward stochastic differential equations On Girsanov's transform for backward stochastic differential equations

2010-11-14

arxiv.org/abs/1011.3228v1

Mathematics

Probability

21 pages

Scientific paper

By using a simple observation that the density processes appearing in Ito's martingale representation theorem are invariant under the change of measures, we establish a non-linear version of the Cameron-Martin formula for solutions of a class of systems of quasi-linear parabolic equations with non-linear terms of quadratic growth. We also construct a local stochastic flow and establish a Bismut type formula for such system of quasi-linear PDEs. Gradient estimates are obtained in terms of the probability representation of the solution. Another interesting aspect indicated in the paper is the connection between the non-linear Cameron-Martin formula and a class of forward-backward stochastic differential equations(FBSDEs).

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