Planar diagrams and Calabi-Yau spaces

TL;DR

This paper investigates the relationship between planar diagrams and Calabi-Yau spaces, constructing geometries for matrix models and calculating correlators, revealing new solutions and properties in multi-matrix theories.

Contribution

It provides a detailed method to construct Calabi-Yau geometries from matrix models and solves previously unknown correlator problems, linking geometry with matrix model physics.

Findings

Constructed Calabi-Yau spaces for a class of matrix models.

Solved loop equations for specific two-matrix models.

Discovered eigenvalue entanglement property in multi-matrix models.

Abstract

Large N geometric transitions and the Dijkgraaf-Vafa conjecture suggest a deep relationship between the sum over planar diagrams and Calabi-Yau threefolds. We explore this correspondence in details, explaining how to construct the Calabi-Yau for a large class of M-matrix models, and how the geometry encodes the correlators. We engineer in particular two-matrix theories with potentials W(X,Y) that reduce to arbitrary functions in the commutative limit. We apply the method to calculate all correlators <tr X^{p}> and <tr Y^{p}> in models of the form W(X,Y)=V(X)+U(Y)-XY and W(X,Y)=V(X)+YU(Y^{2})+XY^{2}. The solution of the latter example was not known, but when U is a constant we are able to solve the loop equations, finding a precise match with the geometric approach. We also discuss special geometry in multi-matrix models, and we derive an important property, the entanglement of eigenvalues, governing the expansion around classical vacua for which the matrices do not commute.