Parabolic Anderson model on Heisenberg groups: The Itô setting

Parabolic Anderson model on Heisenberg groups: The Itô setting
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海森堡群的抛物线安德森模型:Ità 设置

DOI:
10.1016/j.jfa.2023.109920
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发表时间:
2023
影响因子:
1.7
通讯作者:
Wang, Jing
Wang, Jing
中科院分区:
数学1区
文献类型:
--
作者:
Baudoin, Fabrice;Ouyang, Cheng;Tindel, Samy;Wang, Jing

文献摘要

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在本文中,我们将注意力集中在 n 阶海森堡群 H n 上定义的随机热方程。该方程写为 ∂ t u= 1 2 Δ u+ u W˙ α,其中 Δ 是 H n 和 {W˙ α 上的亚椭圆拉普拉斯算子; α> 0} 是一族高斯时空噪声,其在时间上是白色的,并且在空间上具有由 (− Δ)− α 生成的协方差结构。我们的目标有三个:(i) 给出噪声 W α 的正确描述;(ii) 证明只要 α> n 2 就可以求解 Itô 意义上的随机热方程;(iii) 给出解 u(t, x) 的一些基本矩估计。
In this note we focus our attention on a stochastic heat equation defined on the Heisenberg group H n of order n. This equation is written as∂ t u= 1 2 Δ u+ u W˙ α, where Δ is the hypoelliptic Laplacian on H n and {W˙ α; α> 0} is a family of Gaussian space-time noises which are white in time and have a covariance structure generated by (− Δ)− α in space. Our aim is threefold:(i) Give a proper description of the noise W α;(ii) Prove that one can solve the stochastic heat equation in the Itô sense as soon as α> n 2;(iii) Give some basic moment estimates for the solution u (t, x).