String theory predicts an axiverse of ultralight axions whose effects on CMB polarization, matter power spectrum, and black hole superradiance can be probed by future astrophysical experiments.
Weinberg, Phys
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Resonant cavities enhance axion dark matter decay to two photons via the Purcell effect, offering a competitive search method implementable with pre-existing heterodyne detection schemes.
Piezoelectric materials combined with nuclear spin alignment can source virtual QCD axions with up to 7 orders of magnitude enhanced scalar coupling, allowing resonant detection of the axion via spin precession in the 10^{-5} to 10^{-2} eV range.
Theoretical proposal for a spacecraft-Earth experiment to constrain spin- and velocity-dependent fifth forces mediated by ultralight vector bosons, claiming up to three orders of magnitude improvement over current bounds.
Axion-like particles in the trapped misalignment mechanism produce observable gravitational waves while generating intergalactic magnetic fields that exceed blazar lower bounds in the parameter space promising for gravitational wave detection.
Derives g_aγ ≲ 2×10^{-14} (10 kpc/R) GeV^{-1} constraints on ALP-photon coupling from absence of resonant photon growth in Galactic condensates using extragalactic background limits for 0.08 μeV to 8 eV masses.
Scalar fields in scalar-tensor gravity produce EM radiation through φFμνFμν coupling with resonance amplification that differs from ALP φFμν~Fμν signals, enabling potential distinction and modified gravity tests.
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Axion Condensate Dark Matter Constraints from Resonant Enhancement of Background Radiation
Derives g_aγ ≲ 2×10^{-14} (10 kpc/R) GeV^{-1} constraints on ALP-photon coupling from absence of resonant photon growth in Galactic condensates using extragalactic background limits for 0.08 μeV to 8 eV masses.