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Journal of High Energy Physics

, 2019:194 | Cite as

Gravitational waves from walking technicolor

  • Kohtaroh Miura
  • Hiroshi OhkiEmail author
  • Saeko Otani
  • Koichi Yamawaki
Open Access
Regular Article - Theoretical Physics
  • 23 Downloads

Abstract

We study gravitational waves from the first-order electroweak phase transition in the SU(Nc) gauge theory with Nf/Nc ≫ 1 (“large Nf QCD”) as a candidate for the walking technicolor, which is modeled by the U(Nf ) × U(Nf ) linear sigma model with classical scale symmetry (without mass term), particularly for Nf = 8 (“one-family model”). This model exhibits spontaneous breaking of the scale symmetry as well as the U(Nf ) × U(Nf ) radiatively through the Coleman-Weinberg mechanism à la Gildener-Weinberg, thus giving rise to a light pseudo dilaton (technidilaton) to be identified with the 125 GeV Higgs. This model possess a strong first-order electroweak phase transition due to the resultant Coleman-Weinberg type potential. We estimate the bubble nucleation that exhibits an ultra supercooling and then the signal for a stochastic gravitational wave produced via the strong first-order electroweak phase transition. We show that the amplitude can be reached to the expected sensitivities of the LISA.

Keywords

Technicolor and Composite Models Beyond Standard Model Higgs Physics Cosmology of Theories beyond the SM 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited

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Copyright information

© The Author(s) 2019

Authors and Affiliations

  • Kohtaroh Miura
    • 1
    • 2
  • Hiroshi Ohki
    • 3
    Email author
  • Saeko Otani
    • 3
  • Koichi Yamawaki
    • 2
  1. 1.Helmholtz-Institut MainzJohannes Gutenberg-Universität MainzMainzGermany
  2. 2.Kobayashi-Maskawa Institute for the Origin of Particles and the UniverseNagoya UniversityNagoyaJapan
  3. 3.Department of PhysicsNara Women’s UniversityNaraJapan

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