Multistep strongly first order phase transitions from new fermions at the TeV scale

2018/12/31 by Andrei Angelescu, Peisi Huang · 65 citations
Computer Science · Physics and Astronomy · #Baryon asymmetry #Computational Physics and Python Applications #Cosmology and Gravitation Theories #Electroweak interaction #Electroweak scale #Fermion #Higgs boson #Large Hadron Collider #Lepton #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #astro-ph.CO #hep-ph

paper · pdf · doi:10.1103/physrevd.99.055023

published in Physical review. D/Physical review. D. 99(5) (American Physical Society) · 29 pages, 7 figures, 3 tables; v2: references added, matches published version

openalex publication_date 2019/03/19 · arxiv created 2019/03/27 · arxiv updated 2019/04/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06

Abstract

In spite of the vast literature on the subject of first order electroweak phase transitions (EWPTs), which can provide the necessary conditions for generating the baryon asymmetry in the Universe, fermion-induced EWPTs still remain a rather uncharted territory. In this paper, we consider a simple fermionic extension of the Standard Model involving one SU(2)_L doublet and two SU(2)_L singlet vectorlike leptons, strongly coupled to the Higgs scalar and with masses close to the TeV scale. We show how such a simple scenario can give rise to a nontrivial thermal history of the Universe, involving strongly first order multistep phase transitions occurring at temperatures close to the electroweak scale. Finally, we investigate the distinct gravitational wave (GW) signatures of these phase transitions at future space-based GW detectors, such as LISA, DECIGO, and BBO, and briefly discuss the possible LHC signatures of the vectorlike leptons.

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