A coupling of the spectral measures at a vertex

Thibault Espinasse (1, 2) , Paul Rochet (3)

1 PSPM - Probabilités, statistique, physique mathématique
2 ICJ - Institut Camille Jordan
3 LMJL - Laboratoire de Mathématiques Jean Leray

Given the adjacency matrix of an undirected graph, we define a coupling of the spectral measures at the vertices, whose moments count the rooted closed paths in the graph. The resulting joint spectral measure verifies numerous interesting properties that allow to recover minors of analytical functions of the adjacency matrix from its generalized moments. We prove an extension of Obata's Central Limit Theorem in growing star-graphs to the multivariate case and discuss some combinatorial properties using Viennot's heaps of pieces point of view.

Mots clés: graph; excursions; Slater determinant; cumulants; heaps of pieces

Domaines: Combinatoire [math.CO]; Probabilités [math.PR]; Théorie spectrale [math.SP]

Thibault Espinasse, Paul Rochet. A coupling of the spectral measures at a vertex. The Electronic Journal of Combinatorics, 2019, 26 (3), ⟨10.37236/8674⟩. ⟨hal-02107855⟩