Hidden axion dark matter decaying through mixing with QCD axion and the 3.5 keV X-ray line

Abstract

Hidden axions may be coupled to the standard model particles through a kinetic or mass mixing with QCD axion. We study a scenario in which a hidden axion constitutes a part of or the whole of dark matter and decays into photons through the mixing, explaining the 3.5 keV X-ray line signal. Interestingly, the required long lifetime of the hidden axion dark matter can be realized for the QCD axion decay constant at an intermediate scale, if the mixing is sufficiently small. In such a two component dark matter scenario, the primordial density perturbations of the hidden axion can be highly non-Gaussian, leading to a possible dispersion in the X-ray line strength from various galaxy clusters and near-by galaxies. We also discuss how the parallel and orthogonal alignment of two axions affects their couplings to gauge fields.

arXiv comment19 pages

References in corpus (69)

• BICEP2 I: Detection Of B-mode Polarization at Degree Angular Scales
• Systematics of Moduli Stabilisation in Calabi-Yau Flux Compactifications
• WISPy Cold Dark Matter
• Detection of An Unidentified Emission Line in the Stacked X-ray spectrum of Galaxy Clusters
• An unidentified line in X-ray spectra of the Andromeda galaxy and Perseus galaxy cluster
• The role of sterile neutrinos in cosmology and astrophysics
• Completing Natural Inflation
• The type IIB string axiverse and its low-energy phenomenology
• Large-Volume Flux Compactifications: Moduli Spectrum and D3/D7 Soft Supersymmetry Breaking
• Light Sterile Neutrinos: A White Paper
• Massive sterile neutrinos as warm Dark Matter
• Sterile neutrinos: the dark side of the light fermions
• The Phenomenology of Right Handed Neutrinos
• Cosmological bounds on pseudo Nambu-Goldstone bosons
• Production of dark matter axions from collapse of string-wall systems
• SUSY Breaking in Local String/F-Theory Models
• Natural inflation with multiple sub-Planckian axions
• Checking the dark matter origin of 3.53 keV line with the Milky Way center
• Thermal axion production
• On a Light Spinless Particle Coupled to Photons
• The Need for Purely Laboratory-Based Axion-Like Particle Searches
• The Poker Face of the Majoron Dark Matter Model: LUX to keV Line
• Constraints on 3.55 keV line emission from stacked observations of dwarf spheroidal galaxies
• Resonantly-Produced 7 keV Sterile Neutrino Dark Matter Models and the Properties of Milky Way Satellites
• Update of axion CDM energy density
• Non-linear isocurvature perturbations and non-Gaussianities
• Evolution of Axionic Strings and Spectrum of Axions Radiated from Them
• On Axion Thermalization in the Early Universe
• Improved estimation of radiated axions from cosmological axionic strings
• A 3.55 keV hint for decaying axion-like particle dark matter
• Thermal axion production in the primordial quark-gluon plasma
• Moduli/Inflaton Mixing with Supersymmetry Breaking Field
• keV Neutrino Model Building
• Axion cold dark matter in view of BICEP2 results
• The 7 keV axion dark matter and the X-ray line signal
• A 3.55 keV Photon Line and its Morphology from a 3.55 keV ALP Line
• Non-Gaussianity from isocurvature perturbations
• New Constraints on a Light Spinless Particle Coupled to Photons
• Tensor Detection Severely Constrains Axion Dark Matter
• Natural and Multi-Natural Inflation in Axion Landscape
• Isocurvature Constraints and Anharmonic Effects on QCD Axion Dark Matter
• A General Analysis of Non-Gaussianity from Isocurvature Perturbations
• Solving the Tension between High-Scale Inflation and Axion Isocurvature Perturbations
• 7 keV sterile neutrino dark matter from split flavor mechanism
• 3.55 keV photon lines from axion to photon conversion in the Milky Way and M31
• Cosmological Moduli Problem in Gauge-mediated Supersymmetry Breaking Theories
• Constraint on Cosmic Density of the String Moduli Field in Gauge-Mediated Supersymmetry-Breaking Theories
• Evolution of a global string network in a matter dominated universe
• Anomaly-free flavor models for Nambu-Goldstone bosons and the 3.5 keV X-ray line signal
• Limits on Isocurvature Perturbations from Non-Gaussianity in WMAP Temperature Anisotropies
• Moduli dark matter and the search for its decay line using Suzaku X-ray telescope
• Non-Gaussianity from Symmetry
• Cosmological Constraint on the String Dilaton in Gauge-mediated Supersymmetry Breaking Theories
• 3.5 keV X-ray Line Signal from Decay of Right-Handed Neutrino due to Transition Magnetic Moment
• Spectrum of Background X-rays from Moduli Dark Matter
• CMB constraint on non-Gaussianity in isocurvature perturbations
• General treatment of isocurvature perturbations and non-Gaussianities
• Non-Gaussianity from Isocurvature Perturbations : Analysis of Trispectrum
• A 3.55 keV line from $\text{DM}\to a\to \gamma$: predictions for cool-core and non-cool-core clusters
• The 3.5 keV X-ray line signal from decaying moduli with low cutoff scale
• Cluster X-ray line at $3.5\mathrm{keV}$ from axion-like dark matter
• Planck-Scale Effects on Global Symmetries: Cosmology of Pseudo-Goldstone Bosons
• Axion Dissipation Through the Mixing of Goldstone Bosons
• Numerical analysis of formation and evolution of global strings in 2+1 dimensions
• Relaxing Isocurvature Bounds on String Axion Dark Matter
• On Supersymmetric Effective Theories of Axion
• Primordial Trispectrum from Isocurvature Fluctuations
• Longevity Problem of Sterile Neutrino Dark Matter
• Cosmological moduli problem in large volume scenario and thermal inflation

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• Two component WIMP-FImP dark matter model with singlet fermion, scalar and pseudo scalar
• QCD Axion on Hilltop by a Phase Shift of $\pi$
• Nonthermal Two Component Dark Matter Model for Fermi-LAT $\gamma$-ray excess and 3.55 keV X-ray Line
• Cosmic Birefringence Triggered by Dark Matter Domination
• Level Crossing between QCD Axion and Axion-Like Particle
• Cosmological Tension of Ultralight Axion Dark Matter and its Solutions
• A Couplet from Flavored Dark Matter
• Non-abelian Dark Matter Solutions for Galactic Gamma-ray Excess and Perseus 3.5 keV X-ray Line
• Axion Periodicity and Coupling Quantization in the Presence of Mixing
• Observational consistency and future predictions for a 3.5 keV ALP to photon line
• Structure formation in a mixed dark matter model with decaying sterile neutrino: the 3.5 keV X-ray line and the Galactic substructure
• Early dark energy by dark Higgs, and axion-induced non-thermal trapping
• Induced Domain Walls of QCD Axion, and Gravitational Waves
• Axion-like particle oscillations
• Resonant production of dark photons from axion without a large coupling
• Phenomenology of the companion-axion model: photon couplings
• Inflaxion Dark Matter
• Reheating-Induced Axion Dark Matter After Low Scale Inflation
• Resolving the QCD Axion Domain Wall Problem with a Light Axion
• Cosmic Birefringence as a probe of dark matter nature: Sterile neutrino and dipolar dark matter
• ALP Anarchy
• Cosmology of the companion-axion model: dark matter, gravitational waves, and primordial black holes