Topological expansion and boundary conditions

Bertrand Eynard (1) , Nicolas Orantin (1)

1 SPhT - Service de Physique Théorique

In this article, we compute the topological expansion of all possible mixed-traces in a hermitian two matrix model. In other words we give a recipe to compute the number of discrete surfaces of given genus, carrying an Ising model, and with all possible given boundary conditions. The method is recursive, and amounts to recursively cutting surfaces along interfaces. The result is best represented in a diagrammatic way, and is thus rather simple to use.

Mots clés: topological expansion; matrix; loop equations; mixte traces; ising; boundary

Domaines: Physique des Hautes Energies - Théorie [hep-th]; Physique mathématique [math-ph]; Physique mathématique [math-ph]

Bertrand Eynard, Nicolas Orantin. Topological expansion and boundary conditions. 2007. ⟨hal-00175739v2⟩