Unquenched Flavor in the Gauge/Gravity Correspondence
Figure 2
(a) A point-like charge (in red) and two lines of charge at different angles. (b) A configuration with many lines of charge. In the asymptotic limit of an infinite number of lines, they just correspond to a radial charge density. This picture depicts an analogous situation to the case of smeared flavored branes, when the fundamental fields are massless.
