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hep-ph2025
Constraints on light QCD and CP-violating axions from the death line of rotation-powered pulsars
Samuel J. Witte, Andrea Caputo, Stefan Stelzl +3
Dense nuclear matter can modify the effective potential of axions, displacing them from their vacuum minimum, and sourcing large external field gradients (``axion hair"). In the ca…
hep-ph2025
Superradiance Constraints from GW231123
Andrea Caputo, Gabriele Franciolini, Samuel J. Witte
Gravitational wave observations have recently revealed with high significance, and high precision, the existence of rapidly rotating black holes, allo…
hep-ph2025
Searching for Axion Dark Matter Near Relaxing Magnetars
Sandip Roy, Anirudh Prabhu, Christopher Thompson +3
Axion dark matter passing through the magnetospheres of magnetars can undergo hyper-efficient resonant mixing with low-energy photons, leading to the production of narrow spectral…