The principal Dirichlet eigenvalue of the sphere minus a high-dimensional orthant decays like a polynomial times 2^{-d}, making the survival exponent of d Brownian particles vanish as d grows.
Random Walks in the High-Dimensional Limit I: The Wiener Spiral
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abstract
We prove limit theorems for random walks with $n$ steps in the $d$-dimensional Euclidean space as both $n$ and $d$ tend to infinity. One of our results states that the path of such a random walk, viewed as a compact subset of the infinite-dimensional Hilbert space $\ell^2$, converges in probability in the Hausdorff distance up to isometry and also in the Gromov-Hausdorff sense to the Wiener spiral, as $d,n\to\infty$. Another group of results describes various possible limit distributions for the squared distance between the random walker at time $n$ and the origin.
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On the first hitting time of a high-dimensional orthant
The principal Dirichlet eigenvalue of the sphere minus a high-dimensional orthant decays like a polynomial times 2^{-d}, making the survival exponent of d Brownian particles vanish as d grows.