The alternate arboreal-gas bunkbed conjecture
The alternate arboreal-gas bunkbed conjecture
Let be a graph, let be a set of posts, and let denote the alternate arboreal gas measure on red-blue edge-colourings, restricted so that no cycle is admissible. An admissible path may change colour only at posts. Write (respectively, ) when there is an admissible path from to that starts with a red edge and ends with a red (respectively, blue) edge. Alternate arboreal-gas bunkbed conjecture. For every such and every pair of vertices ,
This is the arboreal-gas analogue of the alternate bunkbed inequality. The corresponding percolation conjecture is already false in general, and the source gives an outerplanar counterexample to this arboreal-gas version.
Sources & referencesView supporting material
Primary source
Arvind Ayyer, Svante Linusson and Mohan Ravichandran, “The bunkbed problem and the random cluster model”, arXiv:2509.18788 (2025).
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