2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/184428We consider closed free tensionless strings in $AdS_d$, calculate exactly the boundary/boundary string evolution kernel and find the string dynamics to be completely frozen. We interpret therefore the boundary configurations as Wilson loop operators in a confining phase. This is taken as an argument in favor to the dual weakly coupled abelian gauge theory being that of $(d-4)$-forms in the $(d-1)$ dimensional boundary Minkowski space.1+12 pages, v.2: typos, v.3 Published versionHigh Energy Physics - Theorytext