The geometry of Schrödinger symmetry in non-relativistic CFT

The non-relativistic conformal “Schrödinger” 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 Schrödinger 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.