Phenomenological Constraints on Axion Models of Dynamical Dark Matter

Abstract

In two recent papers (arXiv:1106.4546, arXiv:1107.0721), we introduced "dynamical dark matter" (DDM), a new framework for dark-matter physics in which the requirement of stability is replaced by a delicate balancing between lifetimes and cosmological abundances across a vast ensemble of individual dark-matter components whose collective behavior transcends that normally associated with traditional dark-matter candidates. We also presented an explicit model involving axions in large extra spacetime dimensions, and demonstrated that this model has all of the features necessary to constitute a viable realization of the general DDM framework. In this paper, we complete our study by performing a general analysis of all phenomenological constraints which are relevant to this bulk-axion DDM model. Although the analysis in this paper is primarily aimed at our specific DDM model, many of our findings have important implications for bulk axion theories in general. Our analysis can also serve as a prototype for phenomenological studies of theories in which there exist large numbers of interacting and decaying particles.

48 pages, LaTeX, 13 figures, 1 table

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• A Possible Explanation of Low Energy $\gamma$-ray Excess from Galactic Centre and Fermi Bubble by a Dark Matter Model with Two Real Scalars
• Multiple dark matter scenarios from ubiquitous stringy throats
• Dynamical Dark Matter from Strongly-Coupled Dark Sectors
• Distinguishing Dynamical Dark Matter at the LHC
• Dynamical Dark Matter and the Positron Excess in Light of AMS
• Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
• Lines and Boxes: Unmasking Dynamical Dark Matter through Correlations in the MeV Gamma-Ray Spectrum
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• Constraining Dark-Matter Ensembles with Supernova Data
• Off-Diagonal Dark-Matter Phenomenology: Exploring Enhanced Complementarity Relations in Non-Minimal Dark Sectors
• Randomness in the Dark Sector: Emergent Mass Spectra and Dynamical Dark Matter Ensembles
• Extending the Discovery Potential for Inelastic-Dipole Dark Matter with FASER
• Kaluza-Klein Towers in the Early Universe: Phase Transitions, Relic Abundances, and Applications to Axion Cosmology
• Spheres To Jets: Tuning Event Shapes with 5d Simplified Models
• Evaluating Lyman-$\alpha$ Constraints for General Dark-Matter Velocity Distributions: Multiple Scales and Cautionary Tales
• Cosmological Constraints on Unstable Particles: Numerical Bounds and Analytic Approximations
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• The Forward Physics Facility at the High-Luminosity LHC