Unification of gauge and gravity Chern–Simons theories in 3-D space-time Chireen A. Saghir and Laurence W. Shamseddine Eur. Phys. J. C, 77 11 (2017) 780 Published online: 20 November 2017 DOI: 10.1140/epjc/s10052-017-5372-x