Cosmic microwave background polarization in non-commutative space-time S. Tizchang, S. Batebi, M. Haghighat and R. Mohammadi Eur. Phys. J. C, 76 9 (2016) 478 Published online: 30 August 2016 DOI: 10.1140/epjc/s10052-016-4312-5