2017/05/31 by Anna Tokareva · 8 citations
Physics and Astronomy · #Axion #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Electroweak interaction #Electroweak scale #Fermion #Higgs boson #Inflaton #Particle physics theoretical and experimental studies #Physics beyond the Standard Model #Quantum chromodynamics #Standard Model (mathematical formulation) #Strong CP problem #hep-ph #hep-th
paper · pdf · doi:10.1140/epjc/s10052-018-5883-0
published in The European Physical Journal C 78(5) (Springer Science+Business Media)
openalex created_date 2017/06/05 · arxiv created 2017/12/07 · openalex publication_date 2018/05/01 · arxiv updated 2018/07/04 · openalex updated_date 2026/08/05
We present a scale-invariant extension of the Standard model allowing for the Kim-Shifman-Vainstein-Zakharov (KSVZ) axion solution of the strong CP problem in QCD. We add the minimal number of new particles and show that the Peccei-Quinn scalar might be identified with the complex dilaton field. Scale invariance, together with the Peccei-Quinn symmetry, is broken spontaneously near the Planck scale before inflation, which is driven by the Standard Model Higgs field. We present a set of general conditions which makes this scenario viable and an explicit example of an effective theory possessing spontaneous breaking of scale invariance. We show that this description works both for inflation and low-energy physics in the electroweak vacuum. This scenario can provide a self-consistent inflationary stage and, at the same time, successfully avoid the cosmological bounds on the axion. Our general predictions are the existence of colored TeV mass fermion and the QCD axion. The latter has all the properties of the KSVZ axion but does not contribute to dark matter. This axion can be searched via its mixing to a photon in an external magnetic field.