The minimal GUT with inflaton and dark matter unification Heng-Yu Chen, Ilia Gogoladze, Shan Hu, Tianjun Li and Lina Wu Eur. Phys. J. C, 78 1 (2018) 26 Published online: 13 January 2018 DOI: 10.1140/epjc/s10052-017-5496-z