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Cutoff for conjugacy-invariant random wa...
Berestycki, Nathanae...
Cutoff for conjugacy-invariant random walks on the permutation group by Berestycki, Nathanael ( Author )
Australian National University
06-09-2023
We prove a conjecture raised by the work of Diaconis and Shahshahani (1981) about the mixing time of random walks on the permutation group induced by a given conjugacy class. To do this we exploit a connection with coalescence and fragmentation processes and control the Kantorovitch distance by using a variant of a coupling due to Oded Schramm. Recasting our proof in the language of Ricci curvature, our proof establishes the occurrence of a phase transition, which takes the following form in the case of random transpositions: at time $cn/2$, the curvature is asymptotically zero for $c\le 1$ and is strictly positive for $c>1$.
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Article
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29.34 KB
English
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MYR 0.01
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http://arxiv.org/abs/1410.4800
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