Math @ Duke

Publications [#287346] of James H. Nolen
Papers Published
 Nolen, J, Normal approximation for a random elliptic equation,
Probability Theory and Related Fields, vol. 159 no. 34
(2013),
pp. 140, ISSN 01788051 [pdf], [doi]
(last updated on 2017/11/21)
Abstract: We consider solutions of an elliptic partial differential equation in {Mathematical expression} with a stationary, random conductivity coefficient that is also periodic with period {Mathematical expression}. Boundary conditions on a square domain of width {Mathematical expression} are arranged so that the solution has a macroscopic unit gradient. We then consider the average flux that results from this imposed boundary condition. It is known that in the limit {Mathematical expression}, this quantity converges to a deterministic constant, almost surely. Our main result is that the law of this random variable is very close to that of a normal random variable, if the domain size {Mathematical expression} is large. We quantify this approximation by an error estimate in total variation. The error estimate relies on a second order Poincaré inequality developed recently by Chatterjee. © 2013 SpringerVerlag Berlin Heidelberg.


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