Bulk fields in AdS_5 from probe D7 branes

TL;DR

This paper connects bulk fields in Randall-Sundrum AdS_5 models to probe D7 brane world-volume fields in a string theory background, revealing new features for phenomenological model building.

Contribution

It provides a string-theoretic derivation of 5d bulk fields in AdS_5 models using probe D7 branes in the Klebanov-Witten background, highlighting novel features.

Findings

Derived effective 5d Lagrangian from string construction

Identified additional features not common in phenomenological models

Linked bulk fields to probe brane world-volume fields

Abstract

We relate bulk fields in Randall-Sundrum AdS_5 phenomenological models to the world-volume fields of probe D7 branes in the Klebanov-Witten background of type IIB string theory. The string constructions are described by AdS_5 X T^{1,1} in their near-horizon geometry, with T^{1,1} a 5d compact internal manifold that yields N=1 supersymmetry in the dual 4d gauge theory. The effective 5d Lagrangian description derived from the explicit string construction leads to additional features that are not usually encountered in phenomenological model building.