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.

Place of Publication | Kgs. Lyngby |
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Publisher | DTU Mathematics |
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Number of pages | 15 |
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Publication status | Submitted - 2010 |
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Series | Mat-Report |
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Number | 2010-01 |
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ISSN | 0904-7611 |
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- Exit moment spectrum
- Torsional rigidity
- Riemannian submanifolds