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Metastable strings and dumbbells in supersymmetric hybrid inflation

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arxiv 2102.08923 v2 pith:UGCSQALQ submitted 2021-02-17 hep-ph astro-ph.COhep-th

Wilfried Buchmuller This is my paper · ORCID
classification hep-phastro-ph.COhep-th
keywords inflationmodeltextbackgroundbandcasedefectsdumbbells
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abstract

We study symmetry breaking and topological defects in a supersymmetric model with gauge group $\text{U}(2)$, which can be identified with the right-handed part $\text{SU}(2)_R \times \text{U}(1)_{B-L}$ of an extended electroweak symmetry of the Standard Model. The model has two phases of hybrid inflation terminated by tachyonic preheating where either monopoles and strings or, alternatively, dumbbells are formed. In the first case a stochastic gravitational wave background is predicted in the LIGO-Virgo band, possibly extending to the LISA frequency band and to nanohertz frequencies, which is generated by a metastable cosmic string network. In the second case no topological defects survive inflation and no stochastic gravitational wave background is produced.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Metastable cosmic strings are broken at the start

    hep-ph 2026-01 conditional novelty 7.0 of 10

    Metastable cosmic-string networks are typically broken within a Hubble time of formation by finite-temperature effects or by pre-existing monopoles, so matching NANOGrav requires m_M^2/μ ≳ 10^3.

  2. Gravitational Waves from Metastable Cosmic Strings in Supersymmetric New Inflation Model

    hep-ph 2024-11 conditional novelty 6.0 of 10

    A supersymmetric new inflation model with a two-step SU(2) to U(1) to nothing symmetry breaking yields metastable cosmic strings with GUT-scale tension, able to match the PTA signal while evading LIGO-Virgo-KAGRA cons...

  3. Monopoles, Strings, Walls and Gravitational waves

    hep-ph 2026-07 conditional novelty 4.0 of 10

    Breaking SU(2) flavor gauge symmetry stepwise to nothing leaves monopoles, strings, and walls; collapsing walls can form composite strings whose gravitational-wave spectra fit PTA data and lie within reach of LVK and ...

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