On the Wondrous Stability of ALP Dark Matter
arXiv:1911.07885 · doi:10.1088/1475-7516/2020/03/052
Abstract
The very low mass and small coupling of axion-like particles (ALPs) is usually taken as a guarantor of their cosmological longevity, making them excellent dark matter candidates. That said, Bose enhancement could stimulate decays and challenge this paradigm. Here, we analyze and review the cosmological decay of ALPs into photons, taking Bose enhancement into account, thereby going beyond the usual naive perturbative estimate. At first glance, this calculation seems to yield an exponentially growing resonance and therefore an extremely fast decay rate. However, the redshifting of the decay products due to the expansion of the Universe as well as the effective plasma mass of the photon can prevent an efficient resonance. While this result agrees with existing analyses of the QCD axion, for more general ALPs that can feature an enhanced photon coupling, stability is only ensured by a combination of the expansion and the plasma effects.
arXiv comment20 pages, 3 figures. v2: some references added
References in corpus (58)
- Towards the Theory of Reheating After Inflation
- Reheating after Inflation
- The Low-Energy Frontier of Particle Physics
- Universe Reheating after Inflation
- WISPy Cold Dark Matter
- Gravity Waves and Linear Inflation from Axion Monodromy
- New experimental approaches in the search for axion-like particles
- Vector Dark Matter from Inflationary Fluctuations
- Broadband and Resonant Approaches to Axion Dark Matter Detection
- The ORGAN Experiment: An axion haloscope above 15 GHz
- A Clockwork Axion
- Observations of the MIssing Baryons in the warm-hot intergalactic medium
- Relic Abundance of Dark Photon Dark Matter
- Realizing the relaxion from multiple axions and its UV completion with high scale supersymmetry
- Analytic and Numerical Study of Preheating Dynamics
- Neutrino Energy Loss from the Plasma Process at all Temperatures and Densities
- Dark Photon Dark Matter Produced by Axion Oscillations
- The Large-Misalignment Mechanism for the Formation of Compact Axion Structures: Signatures from the QCD Axion to Fuzzy Dark Matter
- Massive hidden photons as lukewarm dark matter
- Natural inflation with multiple sub-Planckian axions
- Parametric Resonance Production of Ultralight Vector Dark Matter
- Parametric resonance in quantum field theory
- Galactic axions search with a superconducting resonant cavity
- Vector dark matter production at the end of inflation
- Making dark matter out of light: freeze-in from plasma effects
- Production of Purely Gravitational Dark Matter: The Case of Fermion and Vector Boson
- Microwave Background Constraints on Mixing of Photons with Hidden Photons
- Stimulated axion decay in superradiant clouds around primordial black holes
- Fast Radio Bursts and Axion Miniclusters
- Opening up the QCD axion window
- Dark Matter Axion Clump Resonance of Photons
- Axion Searches with Microwave Filters: the RADES project
- Electromagnetic emission from axionic clouds and the quenching of superradiant instabilities
- Detecting the Stimulated Decay of Axions at Radio Frequencies
- Future Directions in the Microwave Cavity Search for Dark Matter Axions
- Audible Axions
- Misalignment & Co.: (Pseudo-)scalar and vector dark matter with curvature couplings
- Is the Relaxion an Axion?
- On String Theory Expectations for Photon Couplings to Axion-Like Particles
- Vector Coherent Oscillation Dark Matter
- Looking for Axion Dark Matter in Dwarf Spheroidals
- Cosmological abundance of the QCD axion coupled to hidden photons
- Production and detection of an axion dark matter echo
- Plasma Effects on Lasing of Uniform Ultralight Axion Condensate
- Monodromy Dark Matter
- Photon enhancement in a homogeneous axion dark matter background
- Foamy Dark Matter from Monodromies
- The paradox of axions surviving primordial magnetic fields
- Haloscope searches for dark matter axions at the Center for Axion and Precision Physics Research
- Photon propagation in a cold axion background with and without magnetic field
- Photon Production of Axionic Cold Dark Matter
- Electromagnetic waves propagating in the string axiverse
- Very Light Asymmetric Dark Matter
- Quantum Fluctuations of Axions
- Axion Condensate Dark Matter Constraints from Resonant Enhancement of Background Radiation
- The Klash Proposal: Status and Perspectives
- Axion, photon-pair mixing in models of axion dark matter
- HAYSTAC Status, Results, and Plans
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- Gravitational wave probes of axion-like particles
- Spectral distortion constraints on photon injection from low-mass decaying particles
- On the interplay between astrophysical and laboratory probes of MeV-scale axion-like particles
- Dynamical evolution of axion condensates under stimulated decays into photons
- Axion-like Particles Implications for High-Energy Astrophysics
- How to suppress exponential growth -- on the parametric resonance of photons in an axion background
- Imprints of Axion Superradiance in the CMB
- A search for axion-like particles in light-by-light scattering at the CLIC
- Hidden Photon Dark Matter Interacting via Axion-like Particles
- Post-inflationary axions: a minimal target for axion haloscopes
- Cosmological Relaxation through the Dark Axion Portal
- Kick it like DESI: PNGB quintessence with a dynamically generated initial velocity
- ALP induced polarization effects on photons from galaxy clusters
- The Spectrum of Dark Radiation as a Probe of Reheating
- Early dark energy by dark Higgs, and axion-induced non-thermal trapping
- Challenging the Stability of Light Millicharged Dark Matter
- Tera-Zooming in on light (composite) axion-like particles
- Probing ultra-light dark photon from inverse Compton-like scattering
- Searching for relativistic axions in the sky
- Hidden Photon and Axion Dark Matter from Symmetry Breaking
- Axion-like particle searches with MeerKAT and SKA
- Potential of SKA to Detect CDM ALPs with Radio Astronomy
- COMEX: A Tool for Generating Customized Source Code Representations
- Detecting the -axiverse through parametric resonance
- Beyond thermal approximations: Precise cosmological bounds on Axion-Like Particles