D2-brane Chern-Simons theories: F-maximization = a-maximization

TL;DR

This paper explores the relationship between F-maximization and a-maximization in D2-brane Chern-Simons theories, demonstrating a precise match between gauge theory calculations and supergravity holographic results.

Contribution

It establishes that F-maximization in 3D Chern-Simons theories is equivalent to a-maximization in related 4D theories and confirms the holographic duality through exact free energy matching.

Findings

F = c(nN)^{1/3}a^{2/3} in large N limit

Maximizing F is equivalent to maximizing a

Exact match between gauge theory and supergravity free energies

Abstract

We study a system of N D2-branes probing a generic Calabi-Yau three-fold singularity in the presence of a non-zero quantized Romans mass n. We argue that the low-energy effective N = 2 Chern-Simons quiver gauge theory flows to a superconformal fixed point in the IR, and construct the dual AdS_4 solution in massive IIA supergravity. We compute the free energy F of the gauge theory on S^3 using localization. In the large N limit we find F = c(nN)^{1/3}a^{2/3}, where c is a universal constant and a is the a-function of the "parent" four-dimensional N = 1 theory on N D3-branes probing the same Calabi-Yau singularity. It follows that maximizing F over the space of admissible R-symmetries is equivalent to maximizing a for this class of theories. Moreover, we show that the gauge theory result precisely matches the holographic free energy of the supergravity solution, and provide a similar matching of the VEV of a BPS Wilson loop operator.