Dark Grand Unification in the Axiverse: Decaying Axion Dark Matter and Spontaneous Baryogenesis

Abstract

The quantum chromodynamics axion with a decay constant near the Grand Unification (GUT) scale has an ultralight mass near a neV. We show, however, that axion-like particles with masses near the keV - PeV range with GUT-scale decay constants are also well motivated in that they naturally arise from axiverse theories with dark non-abelian gauge groups. We demonstrate that the correct dark matter abundance may be achieved by the heavy axions in these models through the misalignment mechanism in combination with a period of early matter domination from the long-lived dark glueballs of the same gauge group. Heavy axion dark matter may decay to two photons, yielding mono-energetic electromagnetic signatures that may be detectable by current or next-generation space-based telescopes. We project the sensitivity of next-generation telescopes including $\text{Athena,}$ AMEGO, and e-ASTROGAM to such decaying axion dark matter. If the dark sector contains multiple confining gauge groups, then the observed primordial baryon asymmetry may also be achieved in this scenario through spontaneous baryogenesis. We present explicit orbifold constructions where the dark gauge groups unify with the SM at the GUT scale and axions emerge as the fifth components of dark gauge fields with bulk Chern-Simons terms.

52 pages, 6 figures

References in corpus (29)

• Leptogenesis
• A Mini-Landscape of Exact MSSM Spectra in Heterotic Orbifolds
• GUTs in Type IIB Orientifold Compactifications
• Dark Matter from Axion Strings with Adaptive Mesh Refinement
• Where to find a dark matter sterile neutrino?
• An M Theory Solution to the Strong CP Problem and Constraints on the Axiverse
• The Sphaleron Rate in SU(N) Gauge Theory
• The search for low-mass axion dark matter with ABRACADABRA-10cm
• New Constraints on Sterile Neutrino Dark Matter from $NuSTAR$ M31 Observations
• A deep search for decaying dark matter with XMM-Newton blank-sky observations
• Pulsar Timing Probes of Primordial Black Holes and Subhalos
• Non-thermal Histories and Implications for Structure Formation
• SU(N) gauge theories in 3+1 dimensions: glueball spectrum, string tensions and topology
• Leptogenesis via Axion Oscillations after Inflation
• AMEGO: Exploring the Extreme Multimessenger Universe
• Thermal Squeezeout of Dark Matter
• String Theory and the Dark Glueball Problem
• Introducing DMRadio-GUT, a search for GUT-scale QCD axions
• No evidence for axions from Chandra observation of magnetic white dwarf
• WIMPless Dark Matter from Non-Abelian Hidden Sectors with Anomaly-Mediated Supersymmetry Breaking
• Non-Higgsable QCD and the Standard Model Spectrum in F-theory
• Axion Couplings in Grand Unified Theories
• Towards glueball masses of large-$N$ $\mathrm{SU}(N)$ pure-gauge theories without topological freezing
• Spectator Effects during Leptogenesis in the Strong Washout Regime
• Searches for sterile neutrinos and axionlike particles from the Galactic halo with eROSITA
• Multi-messenger-Athena Synergy White Paper
• Axion Dark Matter
• On Axion Reheating in the String Landscape
• Dark Unification: a UV-complete Theory of Asymmetric Dark Matter

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• Dark Matter prospects with COSI: ALPs, PBHs and sub-GeV Dark Matter
• Axion Dark Matter from Lepton flavor-violating Decays
• Slaying Axion-Like Particles via Gravitational Waves and Primordial Black Holes from Supercooled Phase Transition
• Opening up a window on the postinflationary QCD axion
• Dark Matter from Dark Glueball Dominance
• Spontaneous baryogenesis and generation of gravitational waves in a new model of quintessential $\alpha$-attractor