Yan Qiu

Publication Date



The Black Scholes equation is a fundamental model for derivative pricing. Modifying its assumptions will lead to more realistic but mathematically more complicated models. This dissertation consists of analytical and numerical studies about one particular type of nonlinear Black Scholes models, whose nonlinearity lies in the highest spatial derivative 1 with discontinuous coefficient function. First we smooth out the discontinuous term and focus only on the nonlinearity. We consider the case where the volatility is a smooth function and present some basic existence and uniqueness results. To study the discontinuity we simplify the problem by discretizing the Partial Differential Equation PDE only in time and consider the evolution in a given tiny time step from initial data. We perform convergence and perturbation analysis to the Ordinary Differential Equation (ODE) with discontinuous coefficient and obtain some insight of how the curves, where the discontinuity occurs, evolve in the space-time plane for the PDE. Last we obtain numerical results for the nonlinear PDE in the setting of a moving boundary problem.

Degree Name


Level of Degree


Department Name

Mathematics & Statistics

First Committee Member (Chair)

Jens Lorenz

Second Committee Member

Maria Cristina Pereyra

Third Committee Member

Christine Sauer

Fourth Committee Member

Pedro Embid




Derivative securities--Prices--Mathematical models, Nonlinear partial differential operators.

Document Type