1992/12/17 by P. Di Francesco, C. Itzykson · 1 citation
Physics and Astronomy · #hep-th
published as Annales Poincare Phys.Theor. 59 (1993) 117-140 · 24 pages, uses harvmac macro, 1 figure not included, Saclay preprint SPhT/92-162
arxiv created 1992/12/17 · arxiv updated 2009/11/30
We study a generating function for the sum over fatgraphs with specified valences of vertices and faces, inversely weighted by the order of their symmetry group. A compact expression is found for general (i.e. non necessarily connected) fatgraphs. This expression admits a matrix integral representation which enables to perform semi--classical computations, leading in particular to a closed formula corresponding to (genus zero, connected) trees.