arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2307.08136math.STcs.NAmath.APmath.NAstat.TH
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基于高斯过程先验的数据同化后验一致性研究:二维Navier-Stokes方程

On posterior consistency of data assimilation with Gaussian process priors: the 2D Navier-Stokes equations

Richard Nickl, Edriss S. Titi

AI总结:

该研究针对带高斯过程先验初始条件的二维Navier-Stokes方程贝叶斯数据同化模型,证明了充分测量下后验分布的一致性与收敛速率,还给出了解的反向唯一性定量估计。

摘要:

我们研究了周期二维Navier-Stokes方程的非线性贝叶斯数据同化模型,其初始条件由高斯过程先验建模。我们证明,若系统通过足够多的速度场离散含噪测量值更新,则后验分布最终会集中在时间演化方程的真实解附近,尤其初始条件可通过后验平均向量场一致恢复。我们进一步表明,收敛速率通常不会快于样本量的逆对数速度,但也描述了初始条件满足特定条件时可实现更快收敛速率的情形。在证明过程中,我们给出了二维Navier-Stokes方程解的反向唯一性的显式定量估计。

英文摘要:

We consider a non-linear Bayesian data assimilation model for the periodic two-dimensional Navier-Stokes equations with initial condition modelled by a Gaussian process prior. We show that if the system is updated with sufficiently many discrete noisy measurements of the velocity field, then the posterior distribution eventually concentrates near the ground truth solution of the time evolution equation, and in particular that the initial condition is recovered consistently by the posterior mean vector field. We further show that the convergence rate can in general not be faster than inverse logarithmic in sample size, but describe specific conditions on the initial conditions when faster rates are possible. In the proofs we provide an explicit quantitative estimate for backward uniqueness of solutions of the two-dimensional Navier-Stokes equations.

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