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Approximability of the Eight-Vertex Model

Authors Jin-Yi Cai, Tianyu Liu, Pinyan Lu, Jing Yu

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Author Details

Jin-Yi Cai
  • University of Wisconsin-Madison, WI, USA
Tianyu Liu
  • University of Wisconsin-Madison, WI, USA
Pinyan Lu
  • Shanghai University of Finance and Economics, China
Jing Yu
  • Georgia Institute of Technology, Atlanta, GA, USA

Funding

  • Cai, Jin-Yi: Supported by NSF CCF-1714275.
  • Liu, Tianyu: Supported by NSF CCF-1714275.

Cite As Get BibTex

Jin-Yi Cai, Tianyu Liu, Pinyan Lu, and Jing Yu. Approximability of the Eight-Vertex Model. In 35th Computational Complexity Conference (CCC 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 169, pp. 4:1-4:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020) https://doi.org/10.4230/LIPIcs.CCC.2020.4

Abstract

We initiate a study of the classification of approximation complexity of the eight-vertex model defined over 4-regular graphs. The eight-vertex model, together with its special case the six-vertex model, is one of the most extensively studied models in statistical physics, and can be stated as a problem of counting weighted orientations in graph theory. Our result concerns the approximability of the partition function on all 4-regular graphs, classified according to the parameters of the model. Our complexity results conform to the phase transition phenomenon from physics.
We introduce a quantum decomposition of the eight-vertex model and prove a set of closure properties in various regions of the parameter space. Furthermore, we show that there are extra closure properties on 4-regular planar graphs. These regions of the parameter space are concordant with the phase transition threshold. Using these closure properties, we derive polynomial time approximation algorithms via Markov chain Monte Carlo. We also show that the eight-vertex model is NP-hard to approximate on the other side of the phase transition threshold.

Subject Classification

ACM Subject Classification
  • Theory of computation → Design and analysis of algorithms
Keywords
  • Approximate complexity
  • the eight-vertex model
  • Markov chain Monte Carlo

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