Using model images, the paper shows that combining polarization spiral angles of the direct and first lensed image can constrain M87* spin to about 0.25 for radial-infall models at 5-degree measurement error, but gives weak constraints for most other plasma configurations.
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Supermassive Black Hole Spin Constraints from Polarimetry in an Equatorial Disk Model
Using model images, the paper shows that combining polarization spiral angles of the direct and first lensed image can constrain M87* spin to about 0.25 for radial-infall models at 5-degree measurement error, but gives weak constraints for most other plasma configurations.