Quantitative stochastic homogenization and regularity theory of parabolic equations – Alexandre Bordas

Alexandre Bordas
I2M, Aix-Marseille Université

Date(s) : 05/04/2019   iCal
11 h 00 min - 12 h 00 min

We develop a quantitative theory of stochastic homogenization for linear, uniformly parabolic equations with coefficients depending on space and time. Inspired by recent works in the elliptic setting, our analysis is focused on certain subadditive quantities derived from a variational interpretation of parabolic equations. These subadditive quantities are intimately connected to spatial averages of the fluxes and gradients of solutions. We implement a renormalization-type scheme to obtain an algebraic rate for their convergence, which is essentially a quantification of the weak convergence of the gradients and fluxes of solutions to their homogenized limits. As a consequence, we obtain estimates of the homogenization error for the Cauchy-Dirichlet problem which are optimal in stochastic integrability. We also develop a higher regularity theory for solutions of the heterogeneous equation, including a uniform C0,1-type estimate and a Liouville theorem of every finite order.


Vidéo : Des particules se déplaçant de manière aléatoire dans un environnement aléatoire



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