Partition functions and the continuum limit in Penner matrix models

Abstract

We present an implementation of the method of orthogonal polynomials which is particularly suitable to study the partition functions of Penner random matrix models, to obtain their explicit forms in the exactly solvable cases, and to determine the coefficients of their perturbative expansions in the continuum limit. The method relies on identities satisfied by the resolvent of the Jacobi matrix in the three-term recursion relation of the associated families of orthogonal polynomials. These identities lead to a convenient formulation of the string equations. As an application, we show that in the continuum limit the free energy of certain exactly solvable models like the linear and double Penner models can be written as a sum of gaussian contributions plus linear terms. To illustrate the one-cut case we discuss the linear, double and cubic Penner models, and for the two-cut case we discuss theoretically and numerically the existence of a double-branch structure of the free energy for the gaussian Penner model.

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Cited by in corpus (7)

• Critical measures for vector energy: global structure of trajectories of quadratic differentials
• On the probability of positive-definiteness in the gGUE via semi-classical Laguerre polynomials
• Fine structure in the large n limit of the non-hermitian Penner matrix model
• Deformed Cauchy random matrix ensembles and large $N$ phase transitions
• Phase space and phase transitions in the Penner matrix model with negative coupling constant
• Do orthogonal polynomials dream of symmetric curves?
• Riemann Hypothesis, Modified Morse Potential and Supersymmetric Quantum Mechanics