Walking-dilaton hybrid inflation with B − L Higgs embedded in dynamical scalegenesis

• Published in: The journal of high energy physics 2024-10, Vol.2024 (10), p.69-22, Article 69
• Main Authors: Liu, Jie, Zhang, He-Xu, Matsuzaki, Shinya, Ishida, Hiroyuki
• Format: Article
• Language: English
• Subjects: Asymmetry; Baryon/Lepton Number Violation; Classical and Quantum Gravitation; Dilatons; Early Universe Particle Physics; Elementary Particles; Embedding; Fermions; Flavor (particle physics); New Gauge Interactions; Particle physics; Phase transitions; Physics; Physics and Astronomy; Pions; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Regular Article - Theoretical Physics; Relativity Theory; Specific BSM Phenomenology; String Theory; Symmetry
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP10(2024)069

A bstract We propose a hybrid inflationary scenario based on eight-flavor hidden QCD with the hidden colored fermions being in part gauged under U(1) B−L . This hidden QCD is almost scale-invariant, so-called walking, and predicts the light scalar meson (the walking dilaton) associated with the spontaneous scale breaking, which develops the Coleman-Weinberg (CW) type potential as the consequence of the nonperturbative scale anomaly, hence plays the role of an inflaton of the small-field inflation. The U(1) B−L Higgs is coupled to the walking dilaton inflaton, which is dynamically induced from the so-called bosonic seesaw mechanism. We explore the hybrid inflation system involving the walking dilaton inflaton and the U(1) B−L Higgs as a waterfall field. We find that observed inflation parameters tightly constrain the U(1) B−L breaking scale as well as the walking dynamical scale to be ~ 10 9 GeV and ~ 10 14 GeV, respectively, so as to make the waterfall mechanism worked. The lightest walking pion mass is then predicted to be around 500 GeV. Phenomenological perspectives including embedding of the dynamical electroweak scalegenesis and possible impacts on the thermal leptogenesis are also addressed.