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arXiv 2502.04572math.PRmath.APmath.DG
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在SPDE可解性问题中的全球几何

Global Geometry within an SPDE Well-Posedness Problem

Hongyi Chen, Cheng Ouyang

AI总结:

本文在闭合黎曼流形上构造了高斯噪声以研究抛物型安德森模型的可解性,通过非正曲率克服测地线非唯一性问题,并得到矩上界和下界。

摘要:

在闭合黎曼流形上,我们构造了一族由正则性参数α≥0索引的内在高斯噪声,以研究抛物型安德森模型的可解性。我们证明,当初始条件粗糙时,假设曲率非正且α满足类似于欧几里得空间里里斯核相关噪声的条件,方程是可解的。非正曲率被用来克服该设置中由测地线非唯一性引入的新困难,这要求对全球几何进行探索。可解性论证也产生了随时间指数增长的矩上界。利用费曼-卡茨公式对矩进行计算,我们还获得了具有有界初始条件的解的随时间指数增长的二阶矩下界。

英文摘要:

On a closed Riemannian manifold, we construct a family of intrinsic Gaussian noises indexed by a regularity parameter $α\geq0$ to study the well-posedness of the parabolic Anderson model. We show that with rough initial conditions, the equation is well-posed assuming non-positive curvature with a condition on $α$ similar to that of Riesz kernel-correlated noise in Euclidean space. Non-positive curvature was used to overcome a new difficulty introduced by non-uniqueness of geodesics in this setting, which required exploration of global geometry. The well-posedness argument also produces exponentially growing in time upper bounds for the moments. Using Feynman-Kac formula for moments, we also obtain exponentially growing in time second moment lower bounds for our solutions with bounded initial condition.

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