Branes, Black Holes and Topological Strings on Toric Calabi-Yau Manifolds

TL;DR

This paper develops methods to compute exact BPS black hole degeneracies on toric Calabi-Yau manifolds, linking gauge theories on D4 branes to 2D q-deformed Yang-Mills theory and confirming conjectures relating D-brane partition functions to topological string amplitudes.

Contribution

It introduces a framework connecting D-brane gauge theories to 2D q-deformed Yang-Mills on toric Calabi-Yau manifolds, providing explicit examples and confirming theoretical conjectures.

Findings

Partition function factorizes into chiral blocks at large N

Leading chiral block matches topological string amplitude

Results agree with Ooguri-Strominger-Vafa conjecture

Abstract

We develop means of computing exact degerenacies of BPS black holes on toric Calabi-Yau manifolds. We show that the gauge theory on the D4 branes wrapping ample divisors reduces to 2D q-deformed Yang-Mills theory on necklaces of P^1's. As explicit examples we consider local P^2, P^1 x P^1 and A_k type ALE space times C. At large N the D-brane partition function factorizes as a sum over squares of chiral blocks, the leading one of which is the topological closed string amplitude on the Calabi-Yau. This is in complete agreement with the recent conjecture of Ooguri, Strominger and Vafa.