Axion and FIMP Dark Matter in a $U(1)$ extension of the Standard Model

Abstract

In the Standard Model a Dark Matter candidate is missing, but it is relatively simple to enlarge the model including one or more suitable particles. We consider in this paper one such extension, inspired by simplicity and by the goal to solve more than just the Dark Matter issue. Indeed we consider a local $U(1)$ extension of the SM providing an axion particle to solve the strong CP problem and including RH neutrinos with appropriate mass terms. One of the latter is decoupled from the SM leptons and can constitute stable sterile neutrino DM. In this setting, the PQ symmetry arises only as an accidental symmetry but its breaking by higher order operators is sufficiently suppressed to avoid introducing a large $\theta$ contribution. The axion decay constant and the RH neutrino masses are related to the same v.e.v.s and the PQ scale and both DM densities are determined by the parameters of the axion and scalar sector. The model predicts in general a mixed Dark Matter scenario with both axion and sterile neutrino DM and is characterised by a reduced density and observational signals from each single component.

arXiv comment30 pages, 6 figures

References in corpus (30)

• Planck 2015 results. XIII. Cosmological parameters
• Planck 2018 results. X. Constraints on inflation
• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• A History of Dark Matter
• Freeze-In Production of FIMP Dark Matter
• The fate of hints: updated global analysis of three-flavor neutrino oscillations
• Investigating the near-criticality of the Higgs boson
• Symmetries and Strings in Field Theory and Gravity
• The Search for Heavy Majorana Neutrinos
• The landscape of QCD axion models
• Planck-Scale Physics and the Peccei-Quinn Mechanism
• Supernova 1987A Constraints on Sub-GeV Dark Sectors, Millicharged Particles, the QCD Axion, and an Axion-like Particle
• Dielectric Haloscopes: A New Way to Detect Axion Dark Matter
• Axions : Theory and Cosmological Role
• Axions from Strings: the Attractive Solution
• Neutrino masses and mixings: Status of known and unknown $3\nu$ parameters
• More Axions from Strings
• Physics potential of the International Axion Observatory (IAXO)
• Search for "Invisible" Axion Dark Matter in the $3.3\text{-}4.2\mu$eV Mass Range
• Early-Universe Simulations of the Cosmological Axion
• Dark Matter from Axion Strings with Adaptive Mesh Refinement
• keV Sterile Neutrino Dark Matter from Singlet Scalar Decays: The Most General Case
• A Simple Motivated Completion of the Standard Model below the Planck Scale: Axions and Right-Handed Neutrinos
• $\nu$DFSZ: a technically natural non-supersymmetric model of neutrino masses, baryogenesis, the strong CP problem, and dark matter
• Explaining the 3.5 keV X-ray Line in a $L_{\mu }-L_{\tau }$ Extension of the Inert Doublet Model
• Gauged Peccei-Quinn Symmetry - A Case of Simultaneous Breaking of SUSY and PQ Symmetry
• Cosmologically allowed regions for the axion decay constant $F_a$
• Indirect Signs of the Peccei-Quinn Mechanism
• FIMP dark matter candidate(s) in a $B-L$ model with inverse seesaw mechanism
• Exploring Supersymmetric CP Violation after LHC Run 2 with Electric Dipole Moments and B Observables