Electroweak monopoles and magnetic dumbbells in grand unified theories

Abstract

We use the $SU(5)$ model to show the presence in grand unified theories of an electroweak monopole and a magnetic dumbbell ("meson") made up of a monopole-antimonopole pair connected by a $Z$-magnetic flux tube. The monopole is associated with the spontaneous breaking of the weak $SU(2{)}_L$ gauge symmetry by the induced vacuum expectation value of a heavy scalar $SU(2{)}_L$ triplet with zero weak hypercharge contained in the adjoint Higgs 24-plet. This monopole carries a Coulomb magnetic charge of $(3/4)(2\pi /e)$ as well as $Z$-magnetic charge, where $2\pi /e$ denotes the unit Dirac magnetic charge. Its total magnetic charge is $\sqrt{3/8}(4\pi /e)$, which is in agreement with the Dirac quantization condition. The monopole weighs about 700 GeV, but because of the attached $Z$-magnetic tube it exists, together with the antimonopole, in a magnetic dumbbell configuration whose mass is expected to lie in the TeV range. The presence of these topological structures in $SU(5)$ and $SO(10)$ and in their supersymmetric extensions provides an exciting new avenue for testing these theories in high-energy colliders.

arXiv comment5 pages, version published in Phys. Rev. D

References in corpus (13)

• Semilocal and Electroweak Strings
• From NANOGrav to LIGO with metastable cosmic strings
• Gravitational Waves from Broken Cosmic Strings: The Bursts and the Beads
• Detailed Stability Analysis of Electroweak Strings
• Semilocal Defects
• GUT Inflation and Proton Decay after WMAP5
• The spontaneous breaking of a metastable string
• Topologically stable, finite-energy electroweak-scale monopoles
• The evolution and persistence of dumbbells
• Axion Model with Intermediate Scale Fermionic Dark Matter
• Destruction of a metastable string by particle collisions
• Probing the mechanism of EWSB with a rho parameter defined in terms of Higgs couplings
• Electroweak Dyons

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