2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/145457We test some recent conjectures about extremal selfdual CFTs, which are the candidate holographic duals of pure gravity in $AdS_3$. We prove that no $c=48$ extremal selfdual CFT or SCFT may possess Monster symmetry. Furthermore, we disprove a recent argument against the existence of extremal selfdual CFTs of large central charge.10 pagesHigh Energy Physics - Theorytext