Planar diagrams and Calabi-Yau spaces

Details Planar diagrams and Calabi-Yau spaces Planar diagrams and Calabi-Yau spaces

2003-09-15

arxiv.org/abs/hep-th/0309151v2

Adv.Theor.Math.Phys. 7 (2004) 619-665

Physics

High Energy Physics

High Energy Physics - Theory

46 pages including 4 figures and 2 appendices

Scientific paper

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 and 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.

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