Macroscopic open strings and gravitational confinement

TL;DR

This paper explores classical string solutions ending on magnetically charged black holes, revealing a gravitational confinement mechanism of magnetic flux and connecting lower-dimensional models to ten-dimensional supergravity.

Contribution

It introduces a novel confinement mechanism for magnetic flux via gravitational back-reaction in Kaluza-Klein theory, linking classical string solutions to higher-dimensional supergravity.

Findings

Strings can end on Kaluza-Klein monopoles without gravity.

Gravitational back-reaction induces magnetic flux confinement.

Connections to localized solutions in ten-dimensional supergravity.

Abstract

We consider classical solutions for strings ending on magnetically charged black holes in four-dimensional Kaluza-Klein theory. We examine the classical superstring and the global vortex, which can be viewed as a nonsingular model for the superstring. We show how both of these can end on a Kaluza-Klein monopole in the absence of self-gravity. Including gravitational back-reaction gives rise to a confinement mechanism of the magnetic flux of the black hole along the direction of the string. We discuss the relation of this work to localized solutions in ten dimensional supergravity.