Gauge Dyonic Strings and Their Global Limit

TL;DR

This paper explores two distinct global limits of six-dimensional supergravity with tensor and Yang-Mills fields, revealing a new limit that admits tensionless strings and potential brane worldvolume interpretations.

Contribution

It identifies a previously unrecognized global limit of supergravity that supports tensionless strings and can model worldvolume theories of coincident branes.

Findings

Discovery of a new global limit with tensionless strings

Existence of a global anti-self-dual string solution

Negative tension does not necessarily cause singularities

Abstract

We show that six-dimensional supergravity coupled to tensor and Yang-Mills multiplets admits not one but two different theories as global limits, one of which was previously thought not to arise as a global limit and the other of which is new. The new theory has the virtue that it admits a global anti-self-dual string solution obtained as the limit of the curved-space gauge dyonic string, and can, in particular, describe tensionless strings. We speculate that this global model can also represent the worldvolume theory of coincident branes. We also discuss the Bogomol'nyi bounds of the gauge dyonic string and show that, contrary to expectations, zero eigenvalues of the Bogomol'nyi matrix do not lead to enhanced supersymmetry and that negative tension does not necessarily imply a naked singularity.