Cutoff for conjugacy-invariant random walks on the permutation group
Cutoff for conjugacy-invariant random walks on the permutation group
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排列群上共轭不变随机游走的截断
DOI:
10.1007/s00440-018-0844-y
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发表时间:
2018
影响因子:
2
通讯作者:
Berestycki N
中科院分区:
文献类型:
--
作者:
Berestycki N
We prove a conjecture raised by the work of Diaconis and Shahshahani (Z Wahrscheinlichkeitstheorie Verwandte Geb 57(2):159–179, 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 Kantorovich distance by using a variant of a coupling due to Oded Schramm as well as contractivity of the distance. 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 timecn/ 2, the curvature is asymptotically zero forand is strictly positive for.
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