Faculty in  Mathematical  Finance             Math Finance Home Conferences Seminars People Open Positions Contact Probability and Computational Finance Seminar Jin Ma University of Southern California Title: Ruin Problems under Model Uncertainty Abstract: In this talk I will discuss some ruin problems for insurance models with investment, in a general market framework that contains uncertainties on both market volatility and claim frequency. The problem naturally leads to the evaluation of the ruin probability under the so-called $G$-expectation, a non-linear expectation developed recently by S. Peng. We prove that the claim process can be naturally described as a class of $G$-Compound Poisson process", a special case of the so-called $G$-L\'evy process studied by Hu-Peng (2010). Such a relation, however, does not seem to be obvious from the original definition of a nonlinear expectation. We also establish the relationship between the study of asymptotic behavior of a ruin probability and the sample path large deviation principle (LDP) of a storage process", defined as a special type of reflected SDE with discontinuous paths, under the $G$-framework. We show that the asymptotic Lundberg bounds can be determined by the rate function of the LDP. Some related issues for the market models under $G$-expectations will be discussed as well.This is a joint work with Xin Wang. Date: Monday, April 9, 2012Time: 5:00 pmLocation: Wean Hall 5409Submitted by:  Dmitry Kramkov