Comparison of Exit Moment Spectra for Extrinsic Metric Balls

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, respectivel...

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Bibliographic Details
Published in:Potential analysis 2012, Vol.36 (1), p.137-153
Main Authors: Hurtado, Ana, Markvorsen, Steen, Palmer, Vicente
Format: Article
Language:English
Subjects:
Functional Analysis
Geometry
Mathematics
Mathematics and Statistics
Potential Theory
Probability Theory and Stochastic Processes
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Summary: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.
ISSN:0926-2601
1572-929X
DOI:10.1007/s11118-011-9223-3