Abstract
We study Markov chains for \(\alpha \)-orientations of plane graphs, these are orientations where the outdegree of each vertex is prescribed by the value of a given function \(\alpha \). The set of \(\alpha \)-orientations of a plane graph has a natural distributive lattice structure. The moves of the up-down Markov chain on this distributive lattice corresponds to reversals of directed facial cycles in the \(\alpha \)-orientation.
A 2-orientation of a plane quadrangulation is an orientation where every inner vertex has outdegree 2. We show that there is a class of plane quadrangulations such that the up-down Markov chain on the 2-orientations of these quadrangulations is slowly mixing. On the other hand the chain is rapidly mixing on 2-orientations of quadrangulations with maximum degree at most 4.
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Felsner, S., Heldt, D. (2016). Mixing Times of Markov Chains of 2-Orientations. In: Kaykobad, M., Petreschi, R. (eds) WALCOM: Algorithms and Computation. WALCOM 2016. Lecture Notes in Computer Science(), vol 9627. Springer, Cham. https://doi.org/10.1007/978-3-319-30139-6_10
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DOI: https://doi.org/10.1007/978-3-319-30139-6_10
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