A holographic form for Wilson's RG

An attempt is made to make precise the connection between Wilson's RG and Holographic RG by writing Wilson's RG in a holographic form. A functional formulation is given for the exact RG evolution of a scalar field in d (flat) dimensions. It is shown that a change of variables maps the action to that for a scalar field in AdS(d+1). This provides a holographic form for Wilson's RG that can be called Holographic RG. This mapping can only be done for a specific form of the cutoff function in the Exact Renormalization Group formalism. The notion of scale and conformal invariance in the presence of a finite UV cutoff is emphasized. The discussion is primarily about the two-point function and the Gaussian fixed point. Some remarks are made about nontrivial fixed points. (C) 2017 The Author(s). Published by Elsevier B.V.