Global electroweak symmetric vacuum

Yang Bai, Seung J. Lee, Minho Son, Fang Ye

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Although the Higgs potential in the Standard Model (SM) contains only a simple electroweak symmetry breaking vacuum in the small field region, additional metastable or global vacua could exist in models beyond the SM. In this paper, we study one intriguing scenario with an additional electroweak symmetric vacuum that could be the global one. For the thermal universe ending at the current metastable vacuum, the electroweak symmetry should stay non-restored at high temperatures. We realize the scenario in a model with Higgs-portal couplings to SM singlet scalars with approximately global O(N) symmetries with a large N. For a large portion of model parameter space, both the quantum and thermal tunneling rates are suppressed such that our current metastable vacuum is long-lived enough. Our scenario predicts order-one changes for the Higgs self-couplings and a large contribution to the signal of the off-shell Higgs invisible decay. It can be partly probed at the LHC Run 3 and well tested at the high luminosity LHC. We also discuss the subcritical (anti-de Sitter) bubbles from the thermal tunneling that could have a large population and interesting cosmological implications.

Original languageEnglish
Article number225
JournalJournal of High Energy Physics
Volume2021
Issue number7
DOIs
Publication statusPublished - 2021 Jul

Keywords

  • Beyond Standard Model
  • Cosmology of Theories beyond the SM
  • Higgs Physics
  • Thermal Field Theory

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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