2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/227946We determine the modified elliptic genus of an M5-brane wrapped on various one modulus Calabi-Yau spaces, using modular invariance together with some known Gopakumar-Vafa invariants of small degrees. As a bonus, we find nontrivial relations among Gopakumar-Vafa invariants of different degrees and genera from modular invariance.13 pagesHigh Energy Physics - Theorytext