Optimal stopping under g_Γexpectation

Details Optimal stopping under g_Γexpectation Optimal stopping under g_Γexpectation

2011-05-11

arxiv.org/abs/1105.2108v1

Mathematics

Probability

Scientific paper

In this paper, we solve the existence problem of optimal stopping problem under some kind of nonlinear expectation named g_\Gamma expectation which was recently introduced in Peng, S.G. and Xu, M.Y. [8]. Our method based on our preceding work on the continuous property of g_\Gamma solution. Generally, the strict comparison theorem does not hold under such nonlinear expectations any more, but we can still modify the classical method to find out an optimal stopping time via continuous property. The mainly used theory in our paper is the monotonic limit theorem of BSDE and nonlinear decomposition theorem of Doob-Meyer's type developed by Peng S.G. [6]. With help of these useful theories, a RCLL modification of the value process can also be obtained by a new approach instead of down-crossing inequality.

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