Vertices from replica in a random matrix theory

Understand

Kontsevitch's work on Airy matrix integrals has led to explicit results for the intersection numbers of the moduli space of curves.

• In a subsequent work Okounkov rederived these results from the edge behavior of a Gaussian matrix integral.
• In our work we consider the correlation functions of vertices in a Gaussian random matrix theory, with an external matrix source, in a scaling limit in which the powers of the matrices and their sizes go to infinity simultaneously in a specified scale.
• We show that the replica method applied to characteristic polynomials of the random matrices, together with a duality exchanging N and the number of points, allows one to recover Kontsevich's results on the intersection numbers, through a simple saddle-point analysis.