Topological structures, dark matter and gravitational waves in E$_{6}$ - INSPIRE

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Topological structures, dark matter and gravitational waves in E $_{6}$

Jun 10, 2024

15 pages

Published in:

JHEP 08 (2024) 060

Published: Aug 7, 2024

e-Print:

2406.06308 [hep-ph]

DOI:

10.1007/JHEP08(2024)060

View in:

ADS Abstract Service

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Abstract: (Springer)

We discuss the appearance of topological structures from the spontaneous breaking of E

_{6}

to the Standard Model via its maximal subgroup SO(10) × U(1)

_{ψ}

. They include dumbbells, metastable strings, as well as domain walls bounded by necklaces. We provide a novel scenario for producing metastable strings based on the symmetry breaking U(1)

_{ψ}

⟶ ℤ

_{8}

⟶ ℤ

_{4}

. The metastable string arises from the merger of ℤ

_{8}

strings that bound a domain wall. An unbroken gauge ℤ

_{2}

symmetry from SO(10) breaking yields viable stable dark matter candidates as well as topologically stable strings. We discuss the gravitational wave emission from two varieties of cosmic strings, namely the superheavy metastable ones and the intermediate scale topologically stable cosmic strings.

Note:

Minor comments included

Cosmology of Theories BSM
Early Universe Particle Physics
Grand Unification
Phase Transitions in the Early Universe

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