The Random Heat Equation in Dimensions Three and Higher: The Homogenization Viewpoint
The Random Heat Equation in Dimensions Three and Higher: The Homogenization Viewpoint
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三维及更高维度的随机热方程:均质化观点
DOI:
10.1007/s00205-021-01694-9
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发表时间:
2021
影响因子:
2.5
通讯作者:
Zeitouni, Ofer
中科院分区:
文献类型:
--
作者:
Dunlap, Alexander;Gu, Yu;Ryzhik, Lenya;Zeitouni, Ofer
We consider the stochastic heat equation, with a smooth space-time-stationary Gaussian random fieldV(s,y), in dimensions, with an initial conditionand a suitably chosen. It is known that, forsmall enough, the diffusively rescaled solutionconverges weakly to a scalar multiple of the solutionof the heat equation with an effective diffusivitya, and that fluctuations converge, also in a weak sense, to the solution of the Edwards-Wilkinson equation with an effective noise strengthand the same effective diffusivity. In this paper, we derive a pointwise approximation, where,is a solution of the SHE with constant initial conditions, andis an explicit corrector. We show thatconverges to a stationary processas, thatconverges pointwise to 0 as, and thatconverges weakly to 0 for fixedt. As a consequence, we derive new representations of the diffusivityaand effective noise strength. Our approach uses a Markov chain in the space of trajectories introduced in , as well as tools from homogenization theory. The correctoris constructed using a seemingly new approximation scheme on a mesoscopic time scale.
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DOI:
--
发表时间:
2017
期刊:
影响因子:
--
作者:
Chiranjib Mukherjee
通讯作者:
Chiranjib Mukherjee
DOI:
10.1214/16-ecp18
发表时间:
2016
期刊:
arXiv: Probability
影响因子:
--
作者:
Chiranjib Mukherjee;A. Shamov;O. Zeitouni
通讯作者:
O. Zeitouni
影响因子:
1.8
作者:
F. Caravenna;Rongfeng Sun;Nikos Zygouras
通讯作者:
Nikos Zygouras
影响因子:
--
作者:
C. Stone
通讯作者:
C. Stone
DOI:
--
发表时间:
1980
期刊:
影响因子:
--
作者:
D. Dawson;H. Salehi
通讯作者:
H. Salehi