Detecting Axion Dark Matter with Black Hole Polarimetry

• DOI: 10.48550/arxiv.2311.02149
• Publication Date: 2023-01-01
• Authors: Xucheng Gan; Lian-Tao Wang; Huangyu Xiao
• Keywords: Black hole (networking)

The axion, as a leading dark matter candidate, is the target of many on-going and proposed experimental searches based on its coupling to photons. Ultralight axions that couple photons can also cause polarization rotation light which be probed by cosmic microwave background. In this work, we show large axion field inevitably developed around black holes due Bose-Einstein condensation axions, enhancing induced birefringence effects. Therefore, propose measuring modulation supermassive hole imaging angles new probe axion-photon matter. oscillating induces image, detectable distinguishable from astrophysical effects angle, it exhibits distinctive temporal variability frequency invariability. We present range couplings within mass $10^{-21}-10^{-16}\text{eV}$ Event Horizon Telescope. parameter space polarimetry will expand with improvement in sensitivity measurement more targets determined masses.