Observable dark radiation from cosmologically safe QCD axion

Abstract

We propose a QCD axion model that avoids the cosmological domain wall problem, introducing a global SU(3)_f family symmetry to which we embed the unwanted PQ discrete symmetry. The spontaneous breaking of SU(3)_f and PQ symmetry predicts eight NG bosons as well as axion, all of which contribute to dark radiation in the Universe. The derivation from the standard model prediction of dark radiation can be observed by future observations of CMB fluctuations. Our model also predicts a sizable exotic kaon decay rate, which is marginally consistent with the present collider data and would be tested by future collider experiments.

arXiv comment16 pages

References in corpus (25)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• A lower bound on the right-handed neutrino mass from leptogenesis
• Towards a complete theory of thermal leptogenesis in the SM and MSSM
• CP violating decays in leptogenesis scenarios
• Leptogenesis as the origin of matter
• Precision measures of the primordial abundance of deuterium
• Axion dark matter from topological defects
• Study of the decay K+ => pi+,nu,nubar in the momentum region 140<Ppi<199 MeV/c
• Axion Cosmology Revisited
• Neutrino Physics from the Cosmic Microwave Background and Large Scale Structure
• A new determination of the primordial He abundance using the HeI 10830A emission line: cosmological implications
• Leptogenesis from $\tilde{N}$-dominated early universe
• Goldstone Bosons as Fractional Cosmic Neutrinos
• Inflation Physics from the Cosmic Microwave Background and Large Scale Structure
• The primordial helium abundance from updated emissivities
• New cosmological mass limit on thermal relic axions
• On Axion Thermalization in the Early Universe
• Third Generation Familons, B Factories, and Neutrino Cosmology
• A Guide to Designing Future Ground-based CMB Experiments
• A theory of extra radiation in the Universe
• Majoron emission in muon and tau decays revisited
• Search for the decay $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ in the momentum region $P_{\pi }<195MeV/c$
• Multiverse Dark Matter: SUSY or Axions

Cited by in corpus (22)

• CMB-S4 Science Case, Reference Design, and Project Plan
• A New Target for Cosmic Axion Searches
• CMB Delensing Beyond the B Modes
• Thermal axion production at low temperatures: a smooth treatment of the QCD phase transition
• Thermal QCD Axions across Thresholds
• Neutrino-Dark Matter Connections in Gauge Theories
• Novel cosmological bounds on thermally-produced axion-like particles
• Hidden Charged Dark Matter and Chiral Dark Radiation
• Strongly broken Peccei-Quinn symmetry in the early Universe
• Probing Decoupling in Dark Sectors with the Cosmic Microwave Background
• Unified Origin of Axion and Monopole Dark Matter, and Solution to the Domain-wall Problem
• Light majoron cold dark matter from topological defects and the formation of boson stars
• Note on a solution to domain wall problem with the Lazarides-Shafi mechanism in axion dark matter models
• Cosmologically safe QCD axion without fine-tuning
• Revisiting signatures of thermal axions in nonstandard cosmologies
• A natural and simple UV completion of the QCD axion model
• Anthropic Bound on Dark Radiation and its Implications for Reheating
• Anomalous Discrete Flavor Symmetry and Domain Wall Problem
• Diphoton excess from hidden U(1) gauge symmetry with large kinetic mixing
• Resolving the QCD Axion Domain Wall Problem with a Light Axion
• New Bounds on Heavy QCD Axions from Big Bang Nucleosynthesis
• Forecasting Constraints on Non-Thermal Light Massive Relics from Future CMB Experiments (CMB-S4/Simons Observatory)