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Probing ALP-Photon Mixing with High-Resolution X-ray Spectroscopy
Yu Zhou, Jiejia Liu, Volodymyr Takhistov, Kazuhisa Mitsuda
https://arxiv.org/abs/2507.22006 https://

Probing ALP-Photon Mixing with High-Resolution X-ray Spectroscopy
Axion-like particles (ALPs) provide a compelling avenue for exploring physics beyond the Standard Model. In astrophysical magnetized plasmas an ALP-photon coupling $g_{aγ}$ induces energy-dependent oscillations in the photon survival probability that imprint modulations on emission spectra. X-ray observations of bright spectrally-smooth sources can provide particularly sensitive probes of ultralight ALPs with masses $m_a \lesssim 10^{-11}$ eV due to long propagation distances, strong magnetic …