2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/202682We show that in some SU(N) type GUTs with the complementary pairs of the conjugated fermion multiplets there naturally appear the relatively light ($M\ll M_{GUT}$) vectorlike fermions which considerably modify the desert physics. In the non-SUSY case they can provide for the unification of the standard coupling constant $α_1$, $α_2$ and $α_S$ whereas in the SUSY case they can increase the unification point up to the string unification limit and decrease $α_S(M_Z)$ down to the value predicted from the low energy physics.LaTeX, 1 figureHigh Energy Physics - Phenomenologytext