Mesons and Flavor on the Conifold

TL;DR

This paper investigates the meson spectrum in a string theory model with added fundamental matter, providing exact and numerical results for massless and massive quarks in a conifold background.

Contribution

It introduces probe D7-branes into the Klebanov-Witten theory and computes the scalar meson spectrum, including exact UV operator dimensions and numerical spectra for massive quarks.

Findings

Exact operator dimensions in the UV limit for massless quarks

Numerical meson spectrum for massive quarks

Scaling behavior of operators at large charge

Abstract

We explore the addition of fundamental matter to the Klebanov-Witten field theory. We add probe D7-branes to the ${\cal N}=1$ theory obtained from placing D3-branes at the tip of the conifold and compute the meson spectrum for the scalar mesons. In the UV limit of massless quarks we find the exact dimensions of the associated operators, which exhibit a simple scaling in the large-charge limit. For the case of massive quarks we compute the spectrum of scalar mesons numerically.