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First-Passage Percolation with Exponential Times on a Ladder

Published online by Cambridge University Press:  19 March 2010

HENRIK RENLUND
HENRIK RENLUND*
Affiliation:
Mathematics Department, Uppsala University, PO Box 480, 751 06 Uppsala, Sweden (e-mail: renlund@math.uu.se)
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Abstract

We consider first-passage percolation on a ladder, i.e., the graph ℕ × {0, 1}, where nodes at distance 1 are joined by an edge, and the times are exponentially i.i.d. with mean 1. We find an appropriate Markov chain to calculate an explicit expression for the time constant whose numerical value is ≈0.6827. This time constant is the long-term average inverse speed of the process. We also calculate the average residual time.

Type
Paper
Information
Combinatorics, Probability and Computing , Volume 19 , Issue 4 , July 2010 , pp. 593 - 601
Copyright
Copyright © Cambridge University Press 2010

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