2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52495We compute the perturbative tachyonic and massless spectra of Type II and Type 0 string theories on non-supersymmetric T^2/Z_N orbifolds, and those on T^4/Z_N ones. Comparing the spectra with one another, we obtain insight about the degeneracy of states and find several pairs of Type 0 orbifolds which could be identified with each other.31 pagesHigh Energy Physics - Theorytext