Comparison of exit time moment spectra for extrinsic metric balls

Ana Hurtado, Steen Markvorsen, Vicente Palmer

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    Abstract

    We prove explicit upper and lower bounds for the $L^1$-moment spectra for the Brownian motion exit time from extrinsic metric balls of submanifolds $P^m$ in ambient Riemannian spaces $N^{n}$. We assume that $P$ and $N$ both have controlled radial curvatures (mean curvature and sectional curvature, respectively) as viewed from a pole in $N$. The bounds for the exit moment spectra are given in terms of the corresponding spectra for geodesic metric balls in suitably warped product model spaces. The bounds are sharp in the sense that equalities are obtained in characteristic cases. As a corollary we also obtain new intrinsic comparison results for the exit time spectra for metric balls in the ambient manifolds $N^n$ themselves.
    Original languageEnglish
    Place of PublicationKgs. Lyngby
    PublisherDTU Mathematics
    Number of pages15
    Publication statusSubmitted - 2010
    SeriesMat-Report
    Number2010-01
    ISSN0904-7611

    Keywords

    • Exit moment spectrum
    • Torsional rigidity
    • Riemannian submanifolds

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