The degree distribution in bipartite planar maps: applications to the Ising model

Details The degree distribution in bipartite planar maps: applications to the Ising model The degree distribution in bipartite planar maps: applications to the Ising model

2002-11-04

arxiv.org/abs/math/0211070v2

Mathematics

Combinatorics

32 pages, 15 figures

Scientific paper

We characterize the generating function of bipartite planar maps counted according to the degree distribution of their black and white vertices. This result is applied to the solution of the hard particle and Ising models on random planar lattices. We thus recover and extend some results previously obtained by means of matrix integrals. Proofs are purely combinatorial and rely on the idea that planar maps are conjugacy classes of trees. In particular, these trees explain why the solutions of the Ising and hard particle models on maps of bounded degree are always algebraic.

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