2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/225370The non-relativistic conformal "Schroedinger" symmetry of some gravity backgrounds proposed recently in the AdS/CFT context, is explained in the "Bargmann framework". The formalism incorporates the Equivalence Principle. Newton-Hooke conformal symmetries, which are analogs of those of Schroedinger in the presence of a negative cosmological constant, are discussed in a similar way. Further examples include topologically massive gravity with negative cosmological constant and the Madelung hydrodynamical description.RevTex, 7 pages, no figures. Presentation rearranged, minor corrections, some more references addedHigh Energy Physics - Theorytext