Dipolar dark matter and CMB B-mode polarization S. Mahmoudi, M. Haghighat, S. Al. Modares Vamegh and R. Mohammadi Eur. Phys. J. C, 80 5 (2020) 402 Published online: 11 May 2020 DOI: 10.1140/epjc/s10052-020-7982-y