A Coupling Argument for the Random Transposition Walk

Details A Coupling Argument for the Random Transposition Walk A Coupling Argument for the Random Transposition Walk

2011-09-18

arxiv.org/abs/1109.3915v1

Mathematics

Probability

Scientific paper

This paper explores the mixing time of the random transposition walk on the symmetric group. While it has long been known that this walk mixes in order n*log(n) time, this result has not previously been attained using coupling. A coupling argument showing the correct order mixing time is presented. This is accomplished by first projecting to conjugacy classes, and then using the Bubley-Dyer path coupling construction. In order to obtain appropriate bounds on the time it takes the path coupling to meet, ideas from Schramm's paper "Compositions of Random Transpositions" are used.

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