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2011 Emergence of Giant Cycles and Slowdown Transition in Random Transpositions and $k$-Cycles
Nathanael Berestycki
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Electron. J. Probab. 16: 152-173 (2011). DOI: 10.1214/EJP.v16-850


Consider the random walk on the permutation group obtained when the step distribution is uniform on a given conjugacy class. It is shown that there is a critical time at which two phase transitions occur simultaneously. On the one hand, the random walk slows down abruptly: the acceleration (i.e., the second time derivative of the distance) drops from $0$ to $-\infty$ at this time as $n\to\infty$. On the other hand, the largest cycle size changes from microscopic to giant. The proof of this last result is considerably simpler and holds more generally than in a previous result of Oded Schramm for random transpositions. It turns out that in the case of random $k$-cycles, this critical time is proportional to $1/[k(k-1)]$, whereas the mixing time is known to be proportional to $1/k$.


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Nathanael Berestycki. "Emergence of Giant Cycles and Slowdown Transition in Random Transpositions and $k$-Cycles." Electron. J. Probab. 16 152 - 173, 2011.


Accepted: 12 January 2011; Published: 2011
First available in Project Euclid: 1 June 2016

zbMATH: 1228.60079
MathSciNet: MR2754801
Digital Object Identifier: 10.1214/EJP.v16-850

Primary: 60J10
Secondary: 05C12, 05C65, 05C80, 60B15, 60K35


Vol.16 • 2011
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