Variational Principle of KPP Front Speeds in Temporally Random Shear Flows

Details Variational Principle of KPP Front Speeds in Temporally Random Shear Flows Variational Principle of KPP Front Speeds in Temporally Random Shear Flows

2005-09-12

arxiv.org/abs/math/0509263v2

Mathematics

Analysis of PDEs

53 pages, 7 figures, Simplified assumptions needed for result, Fixed typos, clarified notation

Scientific paper

We establish the variational principle of Kolmogorov-Petrovsky-Piskunov (KPP) front speeds in temporally random shear flows inside an infinite cylinder, under suitable assumptions of the shear field. A key quantity in the variational principle is the almost sure Lyapunov exponent of a heat operator with random potential. The variational principle then allows us to bound and compute the front speeds. We show the linear and quadratic laws of speed enhancement as well as a resonance-like dependence of front speed on the temporal shear correlation length. To prove the variational principle, we use the comparison principle of solutions, the path integral representation of solutions, and large deviation estimates of the associated stochastic flows.

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