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2001 Invariant Wedges for a Two-Point Reflecting Brownian Motion and the ``Hot Spots'' Problem
Rami Atar
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Electron. J. Probab. 6: 1-19 (2001). DOI: 10.1214/EJP.v6-91


We consider domains $D$ of $R^d$, $d\ge 2$ with the property that there is a wedge $V\subset R^d$ which is left invariant under all tangential projections at smooth portions of $\partial D$. It is shown that the difference between two solutions of the Skorokhod equation in $D$ with normal reflection, driven by the same Brownian motion, remains in $V$ if it is initially in $V$. The heat equation on $D$ with Neumann boundary conditions is considered next. It is shown that the cone of elements $u$ of $L^2(D)$ satisfying $u(x)-u(y)\ge0$ whenever $x-y\in V$ is left invariant by the corresponding heat semigroup. Positivity considerations identify an eigenfunction corresponding to the second Neumann eigenvalue as an element of this cone. For $d=2$ and under further assumptions, especially convexity of the domain, this eigenvalue is simple.


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Rami Atar. "Invariant Wedges for a Two-Point Reflecting Brownian Motion and the ``Hot Spots'' Problem." Electron. J. Probab. 6 1 - 19, 2001.


Accepted: 14 June 2001; Published: 2001
First available in Project Euclid: 19 April 2016

zbMATH: 1125.60310
MathSciNet: MR1873295
Digital Object Identifier: 10.1214/EJP.v6-91

Primary: 60J30

Keywords: convex domains , Neumann eigenvalue problem , Reflecting Brownian motion


Vol.6 • 2001
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