The Annals of Probability

On the sharp Markov property for Gaussian random fields and spectral synthesis in spaces of Bessel potentials

Loren D. Pitt and Raina S. Robeva

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Abstract

Let $\Phi = \{\phi(x)\dvtx x\in \mathbb{R}^2\}$ be a Gaussian random field on the plane. For $A \subset \R^2$, we investigate the relationship between the $\sigma$-field ${\mathcal F}(\Phi, A) = \sigma \{ \phi(x)\dvtx x \in A \} $ and the infinitesimal or germ $\sigma$-field $\,\bigcap_{\varepsilon >0} {\mathcal F} (\Phi, A_{\varepsilon }),$ where $A_{\varepsilon}$ is an $\varepsilon$-neighborhood of A. General analytic conditions are developed giving necessary and sufficient conditions for the equality of these two $\sigma$-fields. These conditions are potential theoretic in nature and are formulated in terms of the reproducing kernel Hilbert space associated with $\Phi $. The Bessel fields $\Phi_{\beta}$\vspace*{-1pt} satisfying the pseudo-partial differential equation $(I-\Delta)^{\beta/2}\phi(x)=\dot W(x)$, $\beta>1$, for which the reproducing kernel Hilbert spaces are identified as spaces of Bessel potentials ${\mathcal L}^{\beta, 2}$, are studied in detail and the conditions for equality are conditions for spectral synthesis in ${\mathcal L}^{\beta,2}$. The case $\beta = 2$ is of special interest, and we deduce sharp conditions for the sharp Markov property to hold here, complementing the work of Dalang and Walsh on the Brownian sheet.

Article information

Source
Ann. Probab., Volume 31, Number 3 (2003), 1338-1376.

Dates
First available in Project Euclid: 12 June 2003

Permanent link to this document
https://projecteuclid.org/euclid.aop/1055425783

Digital Object Identifier
doi:10.1214/aop/1055425783

Mathematical Reviews number (MathSciNet)
MR1989436

Zentralblatt MATH identifier
1040.60042

Subjects
Primary: 60G15: Gaussian processes 60G60: Random fields
Secondary: 31B15: Potentials and capacities, extremal length 31B25: Boundary behavior 60H15: Stochastic partial differential equations [See also 35R60]

Keywords
Gaussian fields germ fields sharp Markov property spectral synthesis.

Citation

Pitt, Loren D.; Robeva, Raina S. On the sharp Markov property for Gaussian random fields and spectral synthesis in spaces of Bessel potentials. Ann. Probab. 31 (2003), no. 3, 1338--1376. doi:10.1214/aop/1055425783. https://projecteuclid.org/euclid.aop/1055425783


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