Topological Defects in the Georgi-Machacek Model - INSPIRE

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Topological Defects in the Georgi-Machacek Model

Chandrasekhar Chatterjee
(
- Keio U.
)
,
Masafumi Kurachi
(
- Keio U. and
- KEK, Tsukuba
)
,
Muneto Nitta
(
- Keio U.
)

Jan 31, 2018

18 pages

Published in:

Phys.Rev.D 97 (2018) 11, 115010

Published: Jun 9, 2018

e-Print:

1801.10469 [hep-ph]

DOI:

10.1103/PhysRevD.97.115010

Report number:

KEK-TH-2033

View in:

ADS Abstract Service

reference search13 citations

Citations per year

Abstract: (APS)

We study topological defects in the Georgi-Machacek model in a hierarchical symmetry breaking in which extra triplets acquire vacuum expectation values before the doublet. We find a possibility of topologically stable non-Abelian domain walls and non-Abelian flux tubes (vortices or cosmic strings) in this model. In the limit of the vanishing U(1)Y gauge coupling in which the custodial symmetry becomes exact, the presence of a vortex spontaneously breaks the custodial symmetry, giving rise to S2 Nambu-Goldstone (NG) modes localized around the vortex corresponding to non-Abelian fluxes. Vortices are continuously degenerated by these degrees of freedom, thereby called non-Abelian. By taking into account the U(1)Y gauge coupling, the custodial symmetry is explicitly broken, the NG modes are lifted to become pseudo-NG modes, and all non-Abelian vortices fall into a topologically stable Z string. This is in contrast to the standard model in which Z strings are nontopological and are unstable in the realistic parameter region. Non-Abelian domain walls also break the custodial symmetry and are accompanied by localized S2 NG modes. Finally, we discuss the existence of domain wall solutions bounded by flux tubes, where their S2 NG modes match. The domain walls may quantum mechanically decay by creating a hole bounded by a flux tube loop, and would be cosmologically safe. Gravitational waves produced from unstable domain walls could be detected by future experiments.

Note:

31 pages, 12 figures

symmetry: custodial
defect: topological
coupling: gauge
vortex: nonabelian
flux tube: nonabelian
symmetry breaking: hierarchy
domain wall
stability
gravitational radiation
Goldstone particle

References(119)

Figures(12)

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