| dc.description.abstract | Scalar extensions of the Standard Model of particle physics are well motivated from several theories that attempt to explain phenomena like neutrino oscillations, hypercharge quantization, etc. By adding more scalars, the Renormalization Group Equations of the theory change as they become active species in the interactions. In the case of Grand Unified Theories, a unification of the gauge and Yukawa couplings is expected at a high energy, which could be used as a selection tool in the space of scalar extensions. Here, the scalar extensions with representations $\{(1,2)_0, (3,1)_0, (\bar{3},1)_0 \}$ under the Standard Model gauge group are investigated at 1-loop. By inserting multiple generations at up to two scales between $10^{3}$ GeV and $10^{15}$ GeV in the Modified Minimal Subtraction scheme, and running the Renormalization Group Equations to the Grand Unified Theory scale $\approx 10^{15}$ GeV, we look for optimal scenarios for gauge and Yukawa unification. A comparison is done against FlexibleSUSY to check that the results are comparable for 2 models; the SM and a model with 2 of each scalar type with pole masses of $10^{3}$ GeV . | eng |