Stacked gamma-ray spectra of 29 AGN-cluster pairs place new bounds on axion-like particles with masses around 1 to 10 neV, improving previous limits by up to a factor of four under the assumed cluster magnetic fields.
Dark Matter Candidates - Axions, Neutralinos, Gravitinos, and Axinos
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abstract
The existence of dark matter provides strong evidence for physics beyond the Standard Model. Extending the Standard Model with the Peccei-Quinn symmetry and/or supersymmetry, compelling dark matter candidates appear. For the axion, the neutralino, the gravitino, and the axino, I review primordial production mechanisms, cosmological and astrophysical constraints, experimental searches, and prospects for experimental identification.
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Active galactic nuclei through the prism of galaxy clusters: bounds on axion-like particles
Stacked gamma-ray spectra of 29 AGN-cluster pairs place new bounds on axion-like particles with masses around 1 to 10 neV, improving previous limits by up to a factor of four under the assumed cluster magnetic fields.