Lowering the scale of fermion triplet leptogenesis with two Higgs doublets

In this paper, we consider the possibility of generating observed baryon asymmetry Universe via leptogenesis in context a triplet fermion-mediated type-III seesaw model neutrino mass. With hierarchical spectrum additional fermions, lower bound on lightest mass is $\ensuremath{\sim}{10}^{10}\text{ }\text{ }\mathrm{GeV}$ for successful leptogenesis, couple orders higher than that type-I case. We investigate lowering framework two-Higgs-doublet models. find bounds can be lowered down to ${10}^{7}\text{ spectrum. If include flavor effects, then further by one order magnitude possible. also discuss if such compatible with naturalness