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arxiv: math/0610345 · v1 · submitted 2006-10-10 · 🧮 math.PR · math.CO

A Tight Bound for the Lamplighter Problem

classification 🧮 math.PR math.CO
keywords lamplighterchainproblemboundboundsconcerningdecaydistance
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We settle an open problem, raised by Y. Peres and D. Revelle, concerning the $L^2$ mixing time of the random walk on the lamplighter graph. We also provide general bounds relating the entropy decay of a Markov chain to the separation distance of the chain, and show that the lamplighter graphs once again provide examples of tightness of our results.

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