Exotic composites: the decay of deficit angles in global-local monopoles

TL;DR

This paper investigates how strong interactions between global and local monopoles affect spacetime structure, revealing critical points where defects vanish and new solutions emerge, with implications for cosmology and braneworld models.

Contribution

It introduces a detailed analysis of composite monopoles with strong coupling, showing defect decay and new Anti-de-Sitter solutions, expanding understanding of topological defects in curved spacetime.

Findings

Global defect disappears at critical coupling.

New Anti-de-Sitter monopole solutions found.

Magnetic monopole can vanish, indicating phase transitions.

Abstract

We study static, spherically symmetric, composite global-local monopoles with a direct interaction term between the two sectors in the regime where the interaction potential is large. At some critical coupling the global defect disappears and with it the deficit angle of the space-time. We find new solutions which represent local monopoles in an Anti-de-Sitter spacetime. In another parameter range the magnetic monopole, or even both, disappear. The decay of the magnetic monopole is accompanied by a dynamical transition from the higgsed phase to the gauge-symmetric phase. We comment on the applications to cosmology, topological inflation and braneworlds.