Abstract
In the present paper we study stochastic homogenization for reaction–diffusion equations with stationary ergodic reactions (including periodic). We first show that under suitable hypotheses, initially localized solutions to the PDE asymptotically become approximate characteristic functions of a ballistically expanding Wulff shape. The next crucial component is the proper definition of relevant front speeds and the subsequent establishment of their existence. We achieve the latter by finding a new relation between the front speeds and the Wulff shape, provided the Wulff shape does not have corners. Once front speeds are proved to exist in all directions, by the above means or otherwise, we are able to obtain general stochastic homogenization results, showing that large space–time evolution of solutions to the PDE is governed by a simple deterministic Hamilton–Jacobi equation whose Hamiltonian is given by these front speeds. Our results are new even for periodic reactions, particularly of ignition type. We primarily consider the case of non-negative reactions but we also extend our results to the more general PDE \({u_{t}= F(D^2 u,\nabla u,u,x,\omega)}\), as long as its solutions satisfy some basic hypotheses including positive lower and upper bounds on spreading speeds in all directions and a sub-ballistic bound on the width of the transition zone between the two equilibria of the PDE.
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Acknowledgments
We thank Mark Freidlin, Antoine Mellet, Panagiotis Souganidis, and Jack Xin for valuable discussions. AZ was supported in part by NSF Grants DMS-1652284 and DMS-1656269. JL was supported in part by NSF Grants DMS-1147523 and DMS-1700028.
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Lin, J., Zlatoš, A. Stochastic Homogenization for Reaction–Diffusion Equations. Arch Rational Mech Anal 232, 813–871 (2019). https://doi.org/10.1007/s00205-018-01334-9
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DOI: https://doi.org/10.1007/s00205-018-01334-9