Anomaly-Free Brane Worlds in Seven Dimensions

TL;DR

This paper constructs an anomaly-free brane world model in seven dimensions by orbifold compactification of supergravity, determining boundary gauge content and couplings through anomaly cancellation constraints.

Contribution

It introduces a novel seven-dimensional supergravity compactification with anomaly cancellation conditions fixing boundary gauge and coupling parameters.

Findings

Anomaly cancellation constrains boundary gauge groups and matter.

Boundary gauge couplings are fixed by anomaly cancellation.

The model features a slice of AdS_7 with branes at orbifold fixed points.

Abstract

We present an orbifold compactification of the minimal seven dimensional supergravity. The vacuum is a slice of AdS_7 where six-branes of opposite tension are located at the orbifold fixed points. The cancellation of gauge and gravitational anomalies restricts the gauge group and matter content on the boundaries. In addition anomaly cancellation fixes the boundary gauge couplings in terms of the gravitational constant, and the mass parameter of the Chern-Simons term.