Bulk, surface and corner free energy series for the chromatic polynomial on the square and triangular lattices
arXiv:1005.3609 · doi:10.1088/1751-8113/43/31/315002
Abstract
We present an efficient algorithm for computing the partition function of the q-colouring problem (chromatic polynomial) on regular two-dimensional lattice strips. Our construction involves writing the transfer matrix as a product of sparse matrices, each of dimension ~ 3^m, where m is the number of lattice spacings across the strip. As a specific application, we obtain the large-q series of the bulk, surface and corner free energies of the chromatic polynomial. This extends the existing series for the square lattice by 32 terms, to order q^{-79}. On the triangular lattice, we verify Baxter's analytical expression for the bulk free energy (to order q^{-40}), and we are able to conjecture exact product formulae for the surface and corner free energies.
17 pages. Version 2: added 4 further term to the series
References in corpus (2)
Cited by in corpus (10)
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