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Sampling from the random cluster model on random regular graphs at all temperatures via Glauber dynamics

Part of: Theory of computing Markov processes

Published online by Cambridge University Press:  09 December 2024

Andreas Galanis Open the ORCID record for Andreas Galanis [Opens in a new window] ,
Leslie Ann Goldberg Open the ORCID record for Leslie Ann Goldberg [Opens in a new window]  and
Paulina Smolarova Open the ORCID record for Paulina Smolarova [Opens in a new window]
Andreas Galanis
Affiliation:
University of Oxford, Oxford, UK
Leslie Ann Goldberg
Affiliation:
University of Oxford, Oxford, UK
Paulina Smolarova*
Affiliation:
University of Oxford, Oxford, UK
*
Corresponding author: Paulina Smolarova; Email: paulina.smolarova@cs.ox.ac.uk
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Abstract

We consider the performance of Glauber dynamics for the random cluster model with real parameter $q\gt 1$ and temperature $\beta \gt 0$. Recent work by Helmuth, Jenssen, and Perkins detailed the ordered/disordered transition of the model on random $\Delta$-regular graphs for all sufficiently large $q$ and obtained an efficient sampling algorithm for all temperatures $\beta$ using cluster expansion methods. Despite this major progress, the performance of natural Markov chains, including Glauber dynamics, is not yet well understood on the random regular graph, partly because of the non-local nature of the model (especially at low temperatures) and partly because of severe bottleneck phenomena that emerge in a window around the ordered/disordered transition. Nevertheless, it is widely conjectured that the bottleneck phenomena that impede mixing from worst-case starting configurations can be avoided by initialising the chain more judiciously. Our main result establishes this conjecture for all sufficiently large $q$ (with respect to $\Delta$). Specifically, we consider the mixing time of Glauber dynamics initialised from the two extreme configurations, the all-in and all-out, and obtain a pair of fast mixing bounds which cover all temperatures $\beta$, including in particular the bottleneck window. Our result is inspired by the recent approach of Gheissari and Sinclair for the Ising model who obtained a similar flavoured mixing-time bound on the random regular graph for sufficiently low temperatures. To cover all temperatures in the RC model, we refine appropriately the structural results of Helmuth, Jenssen and Perkins about the ordered/disordered transition and show spatial mixing properties ‘within the phase’, which are then related to the evolution of the chain.

Keywords

Approximate countingGlauber dynamicsrandom cluster modelapproximate samplingrandom regular graphs

MSC classification

Primary: 60J10: Markov chains (discrete-time Markov processes on discrete state spaces)
Secondary: 68Q87: Probability in computer science (algorithm analysis, random structures, phase transitions, etc.)

Information

Type
Paper
Information
Combinatorics, Probability and Computing , Volume 34 , Issue 3 , May 2025 , pp. 359 - 391
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Copyright
© The Author(s), 2024. Published by Cambridge University Press

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