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Electroweak strings with dark scalar condensates and their stability

Abstract : The stability of “visible” electroweak-type cosmic strings is investigated in an extension of the Standard Model by a minimal dark sector, consisting of a U(1) gauge field, broken spontaneously by a scalar. The visible and dark sectors are coupled through a Higgs-portal and a gauge-kinetic mixing term. It is found that strings whose core is “filled” with a dark scalar condensate exhibit better stability properties than their analogues in the Standard Model, when the electroweak mixing angle is close to θW=π/2. They become unstable as one lets θW approach its physical value. The instability mechanism appears to be a W-boson condensation mechanism found in previous studies on the stability of electroweak strings.
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Submitted on : Wednesday, October 30, 2019 - 8:43:02 AM
Last modification on : Tuesday, January 11, 2022 - 5:56:11 PM

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Péter Forgács, Árpád Lukács. Electroweak strings with dark scalar condensates and their stability. Physical Review D, American Physical Society, 2020, 102 (2), pp.023009. ⟨10.1103/PhysRevD.102.023009⟩. ⟨hal-02338490⟩



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