The D2-D6 System and a Fibered AdS Geometry

TL;DR

This paper investigates the D2-D6 brane system and its associated fibered AdS geometry, revealing a rich phase structure and connecting geometric and field-theoretic descriptions through dualities.

Contribution

It provides a detailed analysis of the D2-D6 system's phase structure and its IR geometry, including the fibered AdS_4 space, and compares it with related brane configurations.

Findings

IR geometry is an AdS_4 space fibered over a compact space for certain brane numbers

The phase structure varies with energy scale and brane count

Qualitative differences explained via geometric and field-theoretic dualities

Abstract

The system of D2 branes localized on or near D6 branes is considered. The world-volume theory on the D2 branes is investigated, using its conjectured relation to the near-horizon geometry. The results are in agreement with known facts and expectations for the corresponding field theory and a rich phase structure is obtained as a function of the energy scale and the number of branes. In particular, for an intermediate range of the number of D6 branes, the IR geometry is that of an AdS_4 space fibered over a compact space. This D2-D6 system is compared to other systems, related to it by compactification and duality and it is shown that the qualitative differences have compatible explanations in the geometric and field-theoretic descriptions. Another system -- that of NS5 branes located at D6 branes -- is also briefly studied, leading to a similar phase structure.