Wellposedness of second order backward SDEs |
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Authors: | H. Mete Soner Nizar Touzi Jianfeng Zhang |
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Affiliation: | 1. Departement Mathematik, ETH (Swiss Federal Institute of Technology), Zürich and Swiss Finance Institute, R?mistrasse 101, 8092, Zurich, Switzerland 2. CMAP, Ecole Polytechnique Paris, 91128, Palaiseau, France 3. Department of Mathematics, University of Southern California, Los Angeles, CA, 90089-2532, USA
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Abstract: | We provide an existence and uniqueness theory for an extension of backward SDEs to the second order. While standard Backward SDEs are naturally connected to semilinear PDEs, our second order extension is connected to fully nonlinear PDEs, as suggested in Cheridito et?al. (Commun. Pure Appl. Math. 60(7):1081–1110, 2007). In particular, we provide a fully nonlinear extension of the Feynman–Kac formula. Unlike (Cheridito et?al. in Commun. Pure Appl. Math. 60(7):1081–1110, 2007), the alternative formulation of this paper insists that the equation must hold under a non-dominated family of mutually singular probability measures. The key argument is a stochastic representation, suggested by the optimal control interpretation, and analyzed in the accompanying paper (Soner et?al. in Dual Formulation of Second Order Target Problems. arXiv:1003.6050, 2009). |
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