Polarized images of synchrotron radiations in curved spacetime Zezhou Hu, Yehui Hou, Haopeng Yan, Minyong Guo and Bin Chen Eur. Phys. J. C, 82 12 (2022) 1166 Published online: 24 December 2022 DOI: 10.1140/epjc/s10052-022-11144-9