Metastable strings and dumbbells in supersymmetric hybrid inflation

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.

arXiv comment20 pages, typos corrected

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• Gravitational Waves from Metastable Cosmic Strings in Supersymmetric New Inflation Model
• New Inflation in Waterfall Region
• Inflation, Proton Decay and Gravitational Waves from Metastable Strings in $SU(4{)}_C\times SU(2{)}_L\times U(1{)}_R$ Model
• Stability of the embedded string in the $SU(N)\times U(1)$ Higgs model and its application
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• Analytical study of classic models of Hybrid Inflation
• Metastable cosmic strings are broken at the start
• Probing Leptogenesis and Pre-BBN Universe with Gravitational Waves Spectral Shapes