Special Session 18: Advanced methodologies in mathematical materials science and biology

Space-time periodic homogenization problem for nonlinear diffusion equations

Tomoyuki Oka
The University of Tokyo
Japan
Co-Author(s):    Goro Akagi
Abstract:
In this talk, we shall discuss a space-time homogenization problem for nonlinear diffusion equations with periodically oscillating (in space and time) coefficients. Main results consist of a homogenization theorem, i.e., convergence of solutions as the period of coefficients goes to zero and characterization of homogenized equations and qualitative properties of homogenized matrices, which deeply depend on the singularity and degeneracy of nonlinear diffusion under a certain critical case in terms of the log-ratio of spatial and temporal periods of the coefficients.