Stochastic homogenization of nonlinear evolution equations with space-time nonlocality
arXiv (Cornell University)(2023)
摘要
In this paper we consider the homogenization problem of nonlinear evolution
equations with space-time non-locality, the problems are given by Beltritti and
Rossi [JMAA, 2017, 455: 1470-1504]. When the integral kernel $J(x,t;y,s)$ is
re-scaled in a suitable way and the oscillation coefficient $\nu(x,t;y,s)$
possesses periodic and stationary structure, we show that the solutions
$u^{\varepsilon}(x,t)$ to the perturbed equations converge to $u_{0}(x,t)$, the
solution of corresponding local nonlinear parabolic equation as scale parameter
$\varepsilon\rightarrow 0^{+}$. Then for the nonlocal linear index $p=2$ we
give the convergence rate such that $||u^\varepsilon
-u_{0}||_{_{L^{2}(\mathbb{R}^{d}\times(0,T))}}\leq C\varepsilon$. Furthermore,
we obtain that the normalized difference
$\frac{1}{\varepsilon}[u^{\varepsilon}(x,t)-u_{0}(x,t)]-\chi(\frac{x}{\varepsilon},
\frac{t}{\varepsilon^{2}}) \nabla_{x}u_{0}(x,t)$ converges to a solution of an
SPDE with additive noise and constant coefficients. Finally, we give some
numerical formats for solving non-local space-time homogenization.
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关键词
stochastic homogenization,nonlinear evolution equations,space-time
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