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On the exit time from an orthant for badly oriented random walks

Abstract : In a recent paper, K. Raschel and R. Garbit proved that the exponential decreasing rate of the probability that a random walk (with all exponential moments) stays in a $d$-dimensional orthant is given by the minimum on this orthant of the Laplace transform of the random walk increments, as soon as this minimum exists. In other cases, the random walk is ''badly oriented'', and the exponential rate may depend on the starting point $x$. We prove here that this rate is nevertheless asymptotically equal to the infimum of the Laplace transform, as some selected coordinates of $x$ tend to infinity.
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Contributor : Rodolphe Garbit Connect in order to contact the contributor
Submitted on : Friday, September 11, 2015 - 11:40:25 AM
Last modification on : Wednesday, October 20, 2021 - 3:18:54 AM
Long-term archiving on: : Tuesday, December 29, 2015 - 12:23:09 AM


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Rodolphe Garbit. On the exit time from an orthant for badly oriented random walks. 2015. ⟨hal-00963650v2⟩



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