2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/55434We consider the AdS/CFT correspondence in the context of 2d CFT and find that essentially all ``single particle'' primary fields with higher spin, predicted from the CFT side are missing from the Kaluza-Klein excitations of the AdS supergravity. The high mass extension of these missing states gives rise to the macroscopic entropy of extremal 5d black holes.7 pages, 4d puzzle resolved by a comment of O. Aharony. The paper deals with the puzzle in the 2d caseHigh Energy Physics - Theorytext