The D8-Brane Tied up: String and Brane Solutions in Massive Type IIA Supergravity

TL;DR

This paper introduces two novel solutions in massive type IIA supergravity involving D8-branes, fundamental strings, D0, D6, and NS5-branes, revealing new intersecting brane configurations with preserved supersymmetry.

Contribution

The paper provides explicit new solutions in Romans' massive type IIA supergravity, expanding understanding of brane intersections involving the D8-brane and massive potentials.

Findings

Solutions involve intersections of fundamental strings, D8-branes, D0, D6, and NS5-branes.

Both solutions preserve 1/4 of the supersymmetry.

Solutions reduce to known configurations in the massless limit.

Abstract

We present two new solutions of Romans' massive type IIA supergravity characterized by the two non-trivial massive potentials of Romans' theory: the NSNS 2-form and the RR 7-form. They can be interpreted respectively as the intersection of a fundamental string and a D8-brane over a D0-brane and the intersection of a D6-brane with a D8-brane over a NSNS5-brane. The D8-brane manifests itself through the mass parameter and in the massless limit one recovers the standard fundamental string and D6-brane solutions. Although these solutions do not have the usual form for BPS bound states at threshold and each of them involves 3 objects, both of them preserve 1/4 of the supersymmetries.