Spatial asymptotics and strong comparison principle for some fractional stochastic heat equations

Foondun, Mohammud and Nualart, Eulalia (2018) Spatial asymptotics and strong comparison principle for some fractional stochastic heat equations. Submitted. pp. 1-32. (In Press)

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    Abstract

    Consider the following  stochastic heat equation, ∂ut(x)/∂t = −ν(−∆)α/2ut(x) + σ(ut(x))F˙(t, x), t > 0, x ∈ Rd . Here −ν(−∆)α/2 is the fractional Laplacian with ν > 0 and α ∈ (0, 2], σ : R → R is a globally Lipschitz function, and F˙(t, x) is a Gaussian noise which is white in time and colored in space. Under some suitable additional conditions, we prove a strong comparison theorem and explore the effect of the initial data on the spatial asymptotic properties of the solution. This constitutes an important extension over a series of works most notably [8], [9], [5] and [4].