Astrophysical Axion Bounds: The 2024 Edition

Abstract

We review the current status of astrophysical bounds on QCD axions, primarily based on the observational effects of nonstandard energy losses on stars, including black-hole superradiance. Over the past few years, many of the traditional arguments have been reexamined both theoretically and using modern data and new ideas have been put forth. This compact review updates similar Lecture Notes written by one of us in 2006 [Lect. Notes Phys. 741 (2008) 51-71].

arXiv commentContribution to 1st Training School of the COST Action COSMIC WISPers (CA21106). Matches published version

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Cited by in corpus (45)

• Supernova axions convert to gamma-rays in magnetic fields of progenitor stars
• Axion Astrophysics
• Supernova limits on 'QCD axion-like particles'
• From Supernovae to Neutron Stars: A Systematic Approach to Axion Production at Finite Density
• Probing protoneutron stars with gamma-ray axionscopes
• Self-Gravity Effects of Ultralight Boson Clouds Formed by Black Hole Superradiance
• NuSTAR bounds on radiatively decaying particles from M82
• Prospects of nuclear-coupled-dark-matter detection via correlation spectroscopy of I${}_2^{+}$ and Ca${}^{+}$
• Solar chameleons: Novel channels
• Pi in the Sky: Neutron Stars with Exceptionally Light QCD Axions
• Topological susceptibility and axion potential in two-flavor superconductive quark matter
• A comprehensive calculation of the Primakoff process and the solar axion flux
• Bounds on heavy axions with an X-ray free electron laser
• Supernova Neutrinos: flavour conversion mechanisms and new physics scenarios
• In-flight positron annihilation as a probe of feebly interacting particles
• QCD topology and axion properties in an isotropic hot and dense medium
• Do Finite Density Effects Jeopardize Axion Nucleophobia in Supernovae?
• Axion-photon conversion in transient compact stars: Systematics, constraints, and opportunities
• Cooling the Shock: New Supernova Constraints on Dark Photons
• Gravitational-Wave Signatures of Nonstandard Neutrino Properties in Collapsing Stellar Cores
• A comprehensive study of ALPs from $B$-decays
• New Constraints on Axion-Like Particles with the NEON Detector at a Nuclear Reactor
• Detecting Supernova Axions with IAXO
• Determining the minimal mass of a proto-neutron star with chirally constrained nuclear equations of state
• Using $\Delta N_{\mathrm{eff}}$ to constrain preferred axion model dark matter
• High Reheating Temperature without Axion Domain Walls
• Stacking the Deck: Gambling on a Light QCD Axion
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• Sub-keV dark matter can strongly ionize molecular clouds
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• Axi-Higgs portal Dark Matter via Wess-Zumino mechanism
• Probing the Axion-Nucleon Coupling with Supergiant Stars
• Fresh look at the diffuse ALP background from supernovae
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• Probing ALP-portal fermionic dark matter at the $e^{+}{e}^{-}$ colliders
• Axion Emission from Proton Cooper Pairs in Neutron Stars
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• Searching for long-lived axion-like particles via displaced vertices at the HL-LHC
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• Axions at the meV Crossroads: Theory, Cosmology, Astrophysics, and Experiments
• Search for New Physics via Low-Energy Electron Recoils with a 4.2 Tonne\times Year Exposure from the LZ Experiment
• Echoes in multi-ALP scenarios
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• Inching toward the QCD Axions with Axion Magnetic Resonance in Helioscopes